Hi Chuck,
Here's what I found in the file for 90H5977:
Elan HLB+4
top: Quilted Maple
body: Maple
neck: Maple, 34 long scale
fingerboard: Ebony with pearloid ovals
finish: Tobaccoburst
pickups: PJ
controls: volume, pan, filter, Q switch, bass cut/flat/boost, treble cut/flat/boost, mono output
birthday: not recorded, but likely early May 1990
originally made for: Washington Music
Washington Music was the first store to sell the Elan Plus electronics regularly. This seems to be a pretty typical example of what they were selling in the early 1990's, with the exception of the finish. Usually the Tobaccoburst was clear in the middle, bursting through one or twoo shades of brown to the edges.
The original owner of this bass was from North Carolina and it was purchased in October of 1990.