Here's what I found in the file for your bass:
serial number: 91 6288
model name: Series I
model number: LBI-4
top: Flame Walnut
accent: Maple laminate
body: Mahogany
back: Flame Walnut
neck: 5-piece Maple and Purpleheart
fingerboard: Ebony
inlays: mother of pearl ovals
pickups: SC-1 with HX
controls: "Series I" volume x2, filter x2, 3-position Q-switch x2, mono 1/4" output, stereo 5-pin output
originally made for: our NAMM show display
birthday: January 2, 1991
While this bass wasn't specifically built for Jason, I'm pretty sure he bought it on a visit to our shop - it sure looks like the one I sold to him, and I recall it was a NAMM bass, so it adds up. He was blown away by the tone and then had us change out all the electronics in his other basses for Series and everything we made for him after this bass was also Series electronics.
Very pretty bass!