The Whole Story
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SD CURLEE HISTORY: 1975-2016
BEFORE WE BEGIN, a rough quickie vintage SD Curlee date reference for you. Here are the four bridges found on original USA SD Curlee & Curlee basses. If your bass is original, the first "crude brass" is 1976-77; "bent brass" 78-79; "Badass II" with poorly notched saddles (bridge is too wide), 79-80; narrower "Badass" countersunk into body, 80-82.
This is the most accurate history of SD Curlee that can be pieced together. Information from direct interviews, examination of many instruments with attention to features and date codes and knowledge of how instruments like this were made (and how workshops work) have all been cross referenced. Not everyone remembers dates the same, but physical evidence tends to tie it all together in a logical order. Still subject to change as new info & discoveries present themselves!
An accurate history of SD Curlee would begin with three men named Dritz, Curlee and Storbeck. Bassist and businessman Randy Curlee owned a music store near Chicago, Illinois and wanted to market some basses in the '70s. Luthier / designer Randy Dritz and woodworker / pattern maker "Sonny" Storbeck were working on similar aims and prototyping instruments. Meeting in 1975, they decided to work together.
Together they formed the S (Storbeck) D (Dritz) Curlee company in Matteson, IL. The prototype bass had a sliding pickup - it was converted to what would become the original "Standard" - mahogany body, deep tenon bolt-in maple neck, large brass covered DiMarzio humbucker. Notice the "It's Only Natural..." ad - the first neck and pocket went all the way down. Dritz' innovative "bolt-in" neck would stop under the bridge after that. Memories aside, this would HAVE to be 1976 because DiMarzio didn't make the Model One pickup (known as "the brick" in SD Curlee circles) until 1976. (Also notice the pickup rings on the guitar - production models used DiMarzio humbuckers with the ears hacked off and drilled for screws, and special single coils made from one coil of a humbucker, also drilled for mounting with no screw ears or ring.)
There were talks of Dan Armstrong's involvement, as he had a slide-in pickup design at the time, but this did not materialize and DiMarzio pickups are what came in all production SD Curlees (USA and the "Int'l" Japan-made import versions to come later). The design for the guitars was there right from the beginning as well. The logo font? Selected by a secretary from those offered by the branding tool company rep! Amazing how some things that become iconic are such casual decisions initially.
Jigs & fixtures were made (aluminum & wood - CNC wasn't happening yet) and building began of the first hundred instruments (75 basses and 25 guitars) for the NAMM show. Again, this had to be 1976 to have the Model One bass pickup in them. (They were specially ordered without plating on the brass covers - these are actually replacements for Gibson EBs and the pickup - now black, #DB120 - is still in the DiMarzio line). There was no culture of independent luthiery, aftermarket parts catalogs or luthier supply houses in those days. Jigs were crude and techniques were improvised; the brass bridges were cast in the back yard barn of a farmer in Indiana who made tractor parts, then jig drilled & assembled in-house at the SD Curlee workshop.
Storbeck liked to build heavy, sturdy things and this accounts for some of the instruments' substantial feel. Dritz designed the bass neck carve & nut width like a '57 Precision he had, and fretted directly into the neck wood like that bass (however into a theoretically more stable three piece laminated neck blank, Storbeck's contribution). The bridge was spaced narrow for minimal taper like an Alembic; the body was influenced by a double cutaway LP Special. They built their own display for the big show and the company was launched.
In a published interview Randy Curlee stated production began May 18, 1976 and the first bass had serial #518. "Production" doesn't mean huge assembly line, this was a workshop. I'm taking an educated guess not many left the shop before late in 1976 because I've never seen, nor verified with any owner of one, an SD Curlee - even the early "brick" pickup STRING THROUGH basses - with matching original DiMarzio pots dating earlier than 1977. The serial numbers were grouped by "series" but nobody alive remembers it. So instrument #4009 is NOT the 4009th instrument built. SDC has bass #1315, Standard with "brick" and crude early bridge, earliest batch with string-through, all original with 1977 pots. Company co-founder Randy Dritz has the same model with a high 3-digit serial number, also original, also with '77 pots.
Co-founder and instrument designer Randy Dritz was no longer with the company by 1977.
I owned a next-generation Standard II with DiMarzio P bass pickups and a more refined brass bridge that pot-dated to '77, serial #3008, so it could have been a late '77 or a '78 with leftover pots. I have never seen nor heard about an original "brick" pickup Standard with a set of original '78 dated pots. From this I'd say the changeover to the cream P pickups (and better bridges) happened internally in late '77, perhaps began shipping in early '78. The DiMarzio Model P was introduced in 1977, so this makes sense. (This also rules out any other models that only came with the cream P pickup existing before 1977).
Standard (original) mahogany body, maple neck, Model One ("brick") pickup under brass cover, string-through (early - then top-load), roughly cast and fit brass bridge.
Guitar with brass bridge, cream DiMarzio humbucker (ears clipped, drilled to screw directly to the wood) by the bridge and a single coil (literally one wrapped coil from a humbucker pickup, no mounting chassis) by the neck.
About this time the pickup change from "Model one" to DiMarzio's new "hot" replacement P-bass pickup (Model P, still in the DiMarzio lineup - DP122, introduced in 1977) was made and the company grew. As the remaining owners were a businessman and a pattern maker but neither were luthiers, there were definite problems in ramping up production to meet demand with no shop leadership and inexperienced helpers.
Enter Denny Rauen. He was a young guy working for a construction company that ran the building SD Curlee was in, a player and ceramic artist with a natural ability for how things work. The workshop was battling a spindle sander they couldn't get working... "If I fix that sander, will you hire me?" He got it working in about 5 minutes, was hired, and within a year he was in charge of the workshop. Denny tweaked the basic Dritz design, retooled everything, designed more jigs and systems and got it into smoother production.
He designed the "Liberty" bass to get some attention. (That's the SD Curlee bass that looks like an old telephone. Keep in mind this was the '70s and a bass shaped like a melting liberty bell wasn't all that far out.) They took some hand made versions to a NAMM show and... surprise, there was Hondo with dozens of them from a Japanese factory. Randy Curlee had licensed the design to Hondo. This was another thing that started during these years - Randy Curlee figured if he was going to get copied (the Japanese companies were copying everybody at this point), he would arrange it and get paid through licensing deals and import versions he could sell as an "International" line of SD Curlees. He was one of the (if not the) first to license and purchase overseas copies of a company's own designs for a lower line - a business model now followed by most big guitar companies and many independents. The flipside of this, though, is he was competing with himself.
Arrangements were made with the Matsumoku factory in Japan for the models branded SD Curlee "Int'l" and through Hondo for "Curlee Design" and "Aspen" series, down to early Korean product wholesaled by Global through other stores. No one knows the serial number code or how many were made. SDC had 2 "Int'l" Liberties ser #0070117 and 0070120. My guess is the first numbers are a batch number or the year, the last numbers that bass' number in the run. Japanese pots don't have date codes, but they (and all the Int'l basses I've seen) have the brass bridges from late '77-78 on them.
Nobody is sure how many USAs were made either; the quoted figure of 15,000... I own much of the old tooling & jigs. There is no way. Plus it has been brought up by people that were there that the numbers were embellished to look like more than actual production. Fudging shipping numbers would also help in ones dealings and banking negotiations... I'm not saying this IS what happened, but I AM saying the numbers were very much on the high side. I'd say 15,000 INCLUDING every bass ever made under license or imported would STILL be high. The serial number system was further confused by "...some of the Fender thing happening, where there was a bin of numbered plates and someone was supposed to keep track of it but it never really happened." Numbers were on the bridge until the change to Badass bridges, then they were on the brass plate that held the body to the neck. As I've been gathering information, there appear to be huge gaps in the serial numbers. This would correspond to a first number being a "series" rather than however many thousand.
In the world of SD Curlee, sometimes just making the bass out of different woods constituted a new model name; I and II were used to identify single and double pickups. At some point the second style bent brass bridge of the bass was changed to the Badass II, which didn't fit the narrow string spacing at the bridge very well. The notches realigning the strings, the basses left the workshop like that.
Neck blanks, 3-piece Maple, were glued up and rough dimensioned out-of-house from around '77 on. Guitar production was about 20% with the rest basses.
Standard now had cream DiMarzio pickup (I) or pickups (II)
Butcher: A Standard with body of butcher block Maple (around 14 pieces glued up), Maple neck
Liberty: The one that looks like an old telephone; it's actually a liberty bell. Designed by Denny Rauen.
(Top row L to R) Paul Wieg, Jack "Hawkeye" Daniels (lead guitarist of The Shadows of Knight), Vicky Maker, Larry, Randy Curlee; (Bottom L to R) Sonny (Homer) Storbeck, Denny Rauen, Mike Zyer (Image & names courtesy Denny Rauen)
PEAK YEARS: 1978-80
Brass plates switched to aluminum during 1979.
It appears 1978 - 1980 is when a majority of the SD Curlee USA instruments were built. I'm going by the date codes on the pots - the vast majority of SD Curlee USAs I've owned, seen, seen pictures of, and date-coded for owners have DiMarzio pots (and features) that date to these years. Basses from this era mainly had Badass II bridges with re-notched saddles and leftover second-style brass bridges. I've only seen the Int'l basses with the brass bridges, and the guitars only had their version of these. These bridges were made by Gary Kahler's company before they became famous for their tremolo.
Here are some pictures of a Standard II I owned - serial 3008, brass plate era, completely original, the Kahler-sourced bridge mentioned above which were used for a very short time, pots all date to 77. So it could have been made in 1977 or after, but definitely not earlier.
:Around '79 original Badass bridges replaced the Badass IIs. The IIs were designed for Fenders; the height was good but the string spacing was wide. The original Badass was for Gibsons - so the string spacing was much better (narrower) but they were too tall - this is where we start to see SD Curlee basses with countersunk bridges.
Many model names and variations happened and I hope to slowly unravel them over time and expand the information on here. The constants were DiMarzio pickups; they did NOT come with Alembic or other brands. Even at their peak, shop manager Denny clearly remembers the company fudging the numbers for publicity while struggling at 25 per month out of the USA workshop "...when things were running smoothly..." An office source disagrees, but between Denny's description and my own experience running Birdsong Guitars in a similar manner to their old USA workshop, as verified by Randy Dritz during a visit, I can verify that as a lot closer to the truth than numbers on a piece of paper that may have been seen in an office.
New SD Curlees of this era generally sold for $500 - $1000, right in line with the USA Gibsons and Fenders of the time. Keep in mind in the '70s you could also buy a 4-bedroom house for what a pickup truck costs now, median household income was fifteen grand a year and gas was under 50 cents a gallon. $500 then is 3 grand now... the only things in 2016 that cost what they did in 1975 are made cheaply in China. In fact, most of what America WAS making in those years is no longer made here at all. We don't even have the factories anymore.
The instruments were shipping world wide. Vicky: "Randy exported the guitars to Italy, Germany and Belgium. He also imported HiWatt tube amps from England and distributed them in the U.S." Homer "Sonny" Storbeck left around '79. Sometime in '79 the switch was made from brass plates to small numbers in chrome, then aluminum. The control cavity shape changed. In about 1980 the SD Curlee logo was replaced with just Curlee. Denny Rauen, frustrated at business decisions that undercut themselves and non-builders changing designs and procedures, had been courted by locals Dean Guitars, eventually leaving SD Curlee in 1980.
Summit: A Standard with Walnut body and neck (both with twin Maple stringers)
Curbeck: A Standard with Walnut body (twin Maple stringers) and Maple neck (twin Walnut stringers) The name is a contraction of Curlee and Storbeck.
Yankee: Around '77 on - slightly asymmetrical horns, concave cut in bottom
Guitars: Standard I (single & humbucker); II (two humbuckers); III (3 singles - have never seen one).
P/J setups were now offered on the basses but are very rarely actually seen - much like the "active electronics", there were actual preamps - SDC has a box of them NOS, no markings, possibly "Starz Guitars" - but how many were installed? Who knows? Never seen one in an SD Curlee.
Oddities of the "S.D. Curlee" era:
Separate fingerboard neck - I've only ever seen one, here it is - a neck from the later countersunk bridge days (used after hanging around a while?) that has been finished, routed & installed - but was in the batch of necks in the "Curlee cave" score. It has serial # 4572 stamped into the back of the headstock. Original-era SD Curlee / Curlee instruments had 3-piece neck blanks that were fretted directly into like a Fender 1-piece, they did not have separate fingerboards.
Production slowed as times and tastes changed in the early 80s. Denny came back to help out a few times but by 1982 SD Curlee was essentially done... ironically just as MTV began airing a Night Ranger video with Jack Blades playing one, and Alec John Such of Bon Jovi. But paint, points and plastic were the next trend and the organic, natural look of the SD Curlee was not any of those. Changes were being made though, as evidenced by the new models of the early 80s, some set-neck, and the finishes.
"Curlee" instruments of this era (the logo was changed since "S" and "D" were no longer with the company) experimented with painted finishes (Denny painted a few in his basement for Curlee after leaving the company, he remembers them as "Candy apple" - SDC has one, the only one I've ever seen or heard of. It is an incomplete build with a red painted neck, Maple fingerboard, and black faced headstock with white logo). There were issues with the durability of their early Watco oil finish, and Randy Curlee invested in a DeVilbiss spray booth to branch out into colors for the guitars, "...some of which were painted red and others yellow." Black seems to be most seen, but if there were a few hundred set neck painted Curlees I'd be very surprised. Fiesta red and black have turned up, and one uncompleted trans-yellow maple-topped Standard.
From the looks of things, there was a definite retooling going on into pointy guitars and basses, and what were referred to as "Strat" (P-style body) basses, just before the end. There are patterns & templates for Strat and LP guitars even! They were planning on painting most of them, as many of them are Poplar - a wood usually not visually appealing and therefore painted over.
Oddities Of The "Curlee" era:
The only "topped" Curlee we know of - a very Hamer-like maple topped, squared-edge Standard, '80 I'm guessing because it's a bolt-neck with fake cover, aluminum plate era, countersunk bridge. I know Hamer was nearby, but when you begin to copy your imitators where else is there to go? This is NOS never completed. Three Star basses, all poplar, all set neck with no plate - a II left before pickup & bridge routs; the "last original" still taped from painting; a completed I with rare black pickup, knobs, and Schaller tuners (formerly owned by Alec Jon Such of Bon Jovi). Next are three "Curlee"-era backs - bolt-in with aluminum cover plate, set-in with false aluminum cover plate, set-in with no plate. This all happened within a year or two. Strange colors (all uncompleted NOS): A Fiesta Red Strat bass, the metallic red Strat bass with black headstock & painted neck, and a black Strat bass. (Fender, please don't sue me. That's what they called them in '80.)
The first pic is a NOS DiMarzio Strat body. DiMarzio was a long time supplier of SD Curlee pickups & pots. 2nd pic is a body template for a Strat. I also have a routing template for the cavities pulled from this DiMarzio body... and an uncompleted mahogany Strat body in with the NOS stash. One can add this math up easily - early '80s Curlee was doing R&D on a Strat copy offering. There is a set of LP body templates as well.
How the pieces fit together to me:
Having the experience I have in guitar company ownership, workshop functioning, and retail - and having come of age in the early '80s way into the gear of the time - and having most if not all of what was left in production (and the templates & tooling) at SD Curlee in 1982, AND being the only person who has spoken with the handful of original-era people around (some of whom still don't speak to each other)... sifting through all of that, here's how it looks to me. I'm going to say (with much respect to all involved) there was a certain amount of changing fashion, difficulty in adapting the product line, some very questionable management decisions and competition from its own imported lines that all contributed to the decision to close up the original shop in 1982.
I'm also, regarding the early years, going to say a trickle of instruments happened in '76 - probably the initial hundred - ramped up through '77, and they found their groove into '78 with the cream pickup era and Denny Rauen.
The company including remaining stock of necks, unfinished bodies & instruments, parts & tooling were sold in 1984. In January of 2013 the resurrected SD Curlee USA company located & acquired this entire stash, pretty much intact; let's just say I was flabbergasted when it turned out to be an hour from the new workshop in Texas! From the looks of it, it was a pretty quick closing & pack-up. We have instruments that were literally pulled half-done from the finish booth, and I'm very familiar with what work areas cleared by forearm into boxes looks like. I've also talked to clients who had instruments in for repair and suppliers of that time.
Victoria, who worked in the office from Fall '77 through the end (and married Randy Curlee in '82, went to high school with Randy Dritz AND Sonny Storbeck was her brother-in-law) offered that the closing of the company also had to do with the economy of the time: "Randy closed the business in 1982 due to sky-high interest rates during the recession of the early 80s which made it impossible to borrow against accounts receivable. Randy and I married, we packed up the all the guitar parts and moved to San Antonio, TX because he had taken a position with Yamaha as the District Manager for TX, OK, LA, and AK."
Thus solving the mystery of why I found the stash an hour from my shop! The man who bought the rights & stock and stored it in San Antonio, TX for almost 30 years wishes to remain anonymous. He was a sales rep for a music accessory wholesaler and was going to restart the company but found "Repping parts and accessories was a hell of a lot easier than building guitars." He was a quiet, retired man who was happy to see the lot go to someone excited about it, also probably VERY relieved to find someone who knew what it all was and was willing to buy every scrap. (Please note, we do not make our new basses from these old parts. We did some "Heritage" builds with some, but the new SD Curlees are made to different spec by different shop processes and with MUCH better parts. Any of the stash for sale are listed in the FAQ down on this page.)
Victoria: "Randy was promoted by Yamaha to head up their Drums, Guitars, and Amps division in Buena Park, CA, so we moved to Orange County. He was very successful in this position and managed all aspects of the division including overseeing much of the advertising while recruiting many top name performers to be featured in the commercials and ads that he coordinated. He had a knack for connecting with other musicians due to his love of music. Randy was a true entrepreneur and always looking for an angle. But his entrepreneurial drive made him restless, and despite his success, he wasn't very happy working for other people and always longed to run his own business. He ultimately left Yamaha and joined Peavey Guitars where he worked until he passed from complications of diabetes at the age of 56. Thank you for keeping S.D. Curlee alive. Randy would be thrilled."
A donation is made from each sale to diabetes causes in memory of Randy Curlee.
Randy Dritz is still fixing things & doing instrument repair in Illinois.
After leaving SD Curlee Denny Rauen worked at Dean where he designed the "Dean Baby" series and such innovations as multiple radius ("Compound radius") fingerboards. He then began a thriving independent luthiery career, currently based out of Milwaukee.
Homer Storbeck is a mystery. The more people who knew him I talk to, the less I actually know about where he went...
It's important we establish the true history of this company because the people involved were some of the first doing what they did and, despite the struggles, put out some amazingly cool, iconic instruments with their own look, sound & legacy. Though never a household name, these basses and guitars were on stages, in studios, in videos, and are played and collected by die-hards with a taste for something different worldwide.
Noted SD Curlee players included:
Jack Blades of Night Ranger (whose post-Curlee Hamers bore quite the resemblance...)
Alec Jon Such of Bon Jovi (We have one of his.)
Bobby Watson of Rufus
(We're still digging... remember this was pre-computers, pre-MTV mostly, so pics are hard to find!)
Special thanks to Randy & Suzy Dritz, Denny Rauen and Victoria Maker for their recollections!
SD CURLEE USA: continuing the legacy
In 2010 as a devoted SD Curlee enthusiast, the growth of Birdsong Guitars allowed Scott Beckwith (me) to resurrect mostly a bass that never got its due in development but also an innovative American company that left too soon. I felt the SD Curlee bass never got the continued refinement it deserved and the folks truly behind it never got the credit they deserved. My pursuit began with the idea of working up a tribute model and ended up with a rebirth of the company! With encouragement from Randy Dritz and Denny Rauen (and others), we re-engineered the SD Curlee bass from Dritz' long-tenon neck out. We kept the visuals and vibe of an SD Curlee but brought the parts quality (truss rods, hardware & bridges) to modern precision and the build quality to boutique standards. I don't care if I could move a truckload of them, I didn't get into this to put a vintage USA name on a Chinese "reissue" so I didn't. I view our chapter in this as a continuation, not a nostalgia act. We brought it back... and brought it forward.
In our workshop today, we're devoted to building very small numbers of these hand made, refined, re-engineered visions. Our hands and workshop are best known for the Birdsong basses (called "The Holy Grail of short scale basses") we've been designing & building since 2004.
There is no factory, there is no assembly line. We MAKE them. We are luthiers who respect the heritage of the craft and the name. The old ones were fine for their day, but crude by current standatds; the new SD Curlees may look very similar and still have the same huge tone, but in weight, playability, balance and quality there is simply no comparison. Designer and company co-founder Randy Dritz called what we're doing "What I'd liked to have done with the originals had we been capable of it."
If you want the best SD Curlee ever, if you want the bass equivalent of a reengineered, hand built custom musclecar with modern performance, we promise Birdsong-quality customer service, our finest workmanship, and an incredible bass... from our hands to yours.
Caretaker of the legacy & Captain of the ship
VINTAGE SD CURLEE FAQ
What parts does SDC have for the oldies?
Gold brass guitar bridges & saddles, NOS
NO bass bridges except a few original crude cast bridges leftover from '77
We DO have the round brass BASS bridge SADDLES & adjustment screws
Used DiMarzio '70s Model P pickups in cream, varying condition
'80s gold aluminum small strap buttons, NOS
Completed "Curlee" ('80-'82) guitar necks, need fitting - routing - finishing
Completed "Curlee" ('80-'82) bass necks, need fitting - routing - finishing
Switchcraft threaded barrel jacks, NOS
NO tuners, sorry.
Some brass-era plates, screws, nut blanks
LOTS of aluminum-era back & control cavity cover plates!
Original knobs (can be brittle, lube 'em on)
What year was my vintage SD Curlee made?
Best way to date one is by the pots - an original USA SD Curlee will have DiMarzio pots with numbers on them. 137 or 134 will ptobably be the first three; the next two will year date the pot. The pot will predate the bass, but not by much. So a pot with 13777 I'd say 77 or 78; 13778, 78 or 79 etc.
Other than this, rough dating by bridge (read company history above for more details):
BASS rough cast crude brass (with brick pickup) 1976-77
BASS bent brass with round barrel saddles 1977-78 (all Japanese "Int'l" basses had these)
USA / "Int'l" GUITARS all had bent brass bridges except for maybe the first few USA - date the pots.
BASS Badass II 1979-80
BASS Badass (original, countersunk into body) 1981-82
I have never verified by pot date info or in-hand any SD Curlee earlier than '77. Anything earlier than that would be a Standard I with crude cast bridge, original pots dating to 76 or earlier, with original components that were being produced at the time. I know some folks think their bass is from 74 or 75, they'd swear that's when they remember buying it, but listen - if you've never had it rewired and the pots were made in 78, and that cream pickup wasn't made before '77, evidence shows that bass couldn't have existed earlier.
What does the serial number tell me?
We're still trying to crack the code - nobody alive remembers. It's not an accurate build number, this we know. I'll start listing some from my collection & files and we'll see if we can find a pattern.
_ 32 - SD Curlee - Std I (brick) - pot date 77 - bolt-in - brass plates - crude bridge string through.
612 - SD Curlee - Std I (brick)
1210 - SD Curlee - Std I (brick) - same specs, '77 pots
1218 - SD Curlee - Std I (brick) - same specs
1315 - SD Curlee - Std I (brick) - pot date 77 - bolt-in - brass plates - crude bridge string through.
1316 - same specs as above, '77 pots
1357 - same specs as above
1365 - same specs as above
2778 - SD Curlee - Std I (brick) but has bent brass bridge
2779 - Same - in Germany
(All basses from here have cream pickups)
2824 - SD Curlee - brass plates
3008 - SD Curlee - Std II - pot date 77 - bolt-in - brass plates - bent brass bridge.
3908 - SD Curlee - GUITAR - pot date 79 - brass plates
(unknown ser.) - SD Curlee - pot date 79 - brass plates - Badass II bridge (LC)
4017 - Butcher block maple body Standard II - brass plates, 79 pots, Badass II bridge
4055 - also has the Badass II bridge
(unknown ser.) SD Curlee - pot date 79 - aluminum plates - Badass II bridge
4366 - SD Curlee - Yankee II - pot date 80 - aluminum plates - Badass II bridge
4560 - Curlee - Std II - aluminum plates, Badass bridge
6287 - Curlee - Strat bass I - pot date 80 - set neck, false plate - aluminum plates - Badass bridge.
How much is it worth?
Hard to say - the beauty of an old SD Curlee is they're not high buck collectibles at this point. I'd say a good USA made instrument with minimal wear and no neck issues $700-$800. Wear, issues, replaced parts, modifications, damage... back it down from there. Rare models, later set-neck stuff, a bit more. Int'l, maybe $600, same deal. Others, especially the "Global" stuff, half of that and on down.
Where was my vintage SD Curlee made?
If it says USA on the headstock it was made in Illinois; "Int'l" it was the legendary Matsumoku factory in Japan. "Aspen" or other, either Japan or Korea. "Global" versions, Korea. There was a lot of licensing of this design going on worldwide. (Anything that says Texas USA is 2011 and after).
What were the original parts?
On USA basses, the tuners were Grover Titans (still available in chrome through AllParts) - pickups were DiMarzio Model One ("the brick" is still available through DiMarzio but the covers are black) or cream Model P pickups (still available through DiMarzio). Cast and bent brass bridges are no longer available (recommended retrofit is the Hipshot Style A in unplated brass, .656 spacing). Badass II bridges and original taller Badass bridges are around used but getting hard to find. Pots were DiMarzio 500K, long threaded Switchcraft barrel jack, Switchcraft 3-way pickup toggle... all available from sources.
What size allen wrench adjusts the Badass II bridge?
My neck is warped, and...
Truss rod issues are known among the old USA SD Curlees & Curlees. Mostly the basses. The necks were fine but the rods weren't up to the task and sometimes they were installed with little access or with no adjustability left. The adjuster is actually a nut, and is notoriously difficult to get to. I took a tiny 5/16" wrench and ground down the box (closed) end until I could get it in and around the nut with enough room to turn it. Another solution is to take a truss rod wrench of the kind used on USA Gibsons (looks like a corn cob pipe) and grind it away 'til it fits in the cavity and on to the nut.
This all gets you to the point where you can see if the truss rod even turns. You will turn to the right... if it doesn't move, try a little to the left first. Firmly but gently. If it goes left but then stops going right, it may be bottomed out - you'll need to undo the nut and place another / more little washers onto the threaded end and then somehow get that nut started back on it.
For a bass been unused and extremely out of adjustment, loosen all the strings. Adjust the rod a quarter turn at a time. Quarter turn, rest; quarter turn, rest. If it takes a full turn maybe let it rest overnight. You must gently bring it back. It may have never been adjusted due to the difficulty/bad design. It may take a few turns. Set it straight, then add back in the string tension. It'll bow again, but not as bad. Repeat process until you can tell how far to "over tighten" that will let the strings pull it straight.
SD Curlee had to make their own truss rods and they never evolved past the original design; some didn't work NEW once they were put in less than perfectly. Keep an eye on the skunk stripe in the neck up by the lower frets - a known (in hindsight) weak point. A bad one will begin to pop that out rather than straighten.
This all is THE main frustration with old USA SD Curlees. - for me as an enthusiast of them, and then the first thing I re-engineered on the modern ones when I became the company. I have old SD Curlees that are rock solid and others that never had a chance. It all came down to the installation of the rod and initial adjustment.
Hope this helps you - just don't be aggressive with it, old glue and old wood and old threads... firmly persuade it instead if that makes sense... lean into it, don't hammer it. If the rod is broken or stripped there's no real repair. I have fresh NOS uninstalled necks but the work involved (fitting - routing - finishing) is not worth it unless the bass has a lot of sentimental value to be played. Modern ones, along with upgrades in every area of parts quality and every step of the making, have an easily accessible wheel-adjusted heavy duty two-way truss rod.
Is it worth restoring?
If that's what you want to do with your old friend you plan on keeping and handing off to some other worthy hands as you depart this mortal coil, yes. If you're looking to turn it for a profit, no. Put the parts on ebay for others and hang it on the wall.
TESTIMONIALS (Today's SD Curlees)
"A BIG thinks to all the talented craftsmen at SD Curlee for building such a fantastic instrument for me. My new bass arrived today and looks just as good as it sounds! I couldn’t be happier… it truly is a great instrument and everything I hoped it would be." ~Dale
"Well, Scott, you and the fine craftsmen there did it again. The bass is beautiful. You hit it right out of the park. Simply amazing. Thanks!" ~Scott C.
"It is absolutely gorgeous!!! Well worth the wait for such quality and craftsmanship. Will look real good next to my Cortobass!!" ~Jack