Here's what I found in the instrument file:
body: Solid Koa
neck: 3-piece Maple
scale: 32 medium
fingerboard: Ebony
inlays: Pearloid (plastic) ovals
pickups: AXY
controls: Spoiler volume, 4-position pickup selector, filter, 2-position Q-switch, mono output
originally made for: Swissvale Music
birthday: November 24, 1982
That's all there is in the file.
The extra switches are not ones that we put in, but the rest of the electronics seems pretty typical for its age. The Q-switch would have originally been located where the added pot is now from the looks of things.
Since the serial number is only stamped on the end of the fingerboard, I'd ask that you also take a Sharpie and scribe it either under one of the pickups or on one of those expansive plains under the backplate so it's not lost in the future, even innocently refretting. Thanks!