Just thought I'd toss a bit on this thread for future readers...
First, I've played Warwick... a lot!
(2) Thumb 4 NT (*99, 94)
(1) Thumb 5 NT (late 90's)
(1) Streamer Stage I (Broad Neck)
(1) Fortress 1 4 (mid 90's)
(1) Fortress 1 5 (*'99) COVID sanity project *see pic
(1) Streamer Stage II 4 ('96)
*EMG JJ w/ East J-Retro
*Ultimately, Aguilar DCB & OBP-3 - 3D printed mounting system
Anyway, the original "JD" Thumb 4 NT was for a US Army member stationed in Germany who was a known quantity in the area club scene. He was a slap player! He had the Bass jacked up under his arm to play. Small body good!
The original headstock had carved out areas on the back around the Schaller tuners to lighten the neck dive. Also, the body was not exactly like a recognized body shape we commonly have come to associate as the Thumb 4 NT. The horns are a bit different and the lower bout was a bit more bulbus.
I think they made the Bass available in mid-late 80's as the "JD" Thumb (John Davis) and quickly dropped the initials and made the body changes, that included dropping the headstock sculpting in favor of the smaller Gotoh GB-7 light weight tuners. I believe it came stock with EMG pickups before Warwick started making MEC electronics. Duncan Basslines were also available as an option.
&
A very customized SSI BN with Delano pickups, preamp, custom shop Brass bridge and two-tone Hipshot Ultralights (first set ever!) tuning keys.
I'd like to have another Thumb 4 and play it like Jack Bruce. Kinda like an Upright!