From 1988, the only place the number would be is stamped directly into the Ebony of the fingerboard, so when you get the bass, please write it in the electronics cavity or under one of the pickups so it isn't lost in the future.
Here's what's in the file for 88S5033:
top: Quilted Maple
body: Mahogany
neck: Maple, 32 medium scale
fingerboard: Ebony with pearloid inalys
pickups: AXY
controls: volume, filter, 2-position Q switch, 4-position rotary pickup selector switch
output: mono
originally built for: Musik Tomme
birthday: not recorded, but likely late August, 1988
We haven't heard from this bass since it was built.
(Message edited by mica on November 21, 2005)