Hi Wilfred,
Here's what I found in the file for this guitar:
Series II - IILG6 79-1492
top and back: Mahogany
body: Mahogany
neck: Maple and Purpleheart, 25.5 long scale
fingerboard: Ebony with mother of pearl inlays
peghead veneers: Mahogany
pickups: SC-1 and HX
controls: Series II
birthday: December 20, 1979
originally made for: not recorded
Before either of the registered owners had it, it was for sale used at the Guitar Exchange in MD. Then it was for sale used at Washington Music in MD.
This guitar has 2 registered owners, neither one was the original owner. It was in New York and Colorado.
In 1991 the guitar was sent here for repair. We installed threaded metal inserts on the backplate and the pickup selector switch plate. There was some repair work done to the preamp card, it wasn't offering effective low-frequency hum cancelling. This was not the same thign as what we call the upgrade now.
Is this guitar in your collection? If you're able to supply some photos, that would be cool, since a Mahogany top and back is pretty unusual.