Hi Steve,
Here's what I found out in the file for this bass:
Siganture Deluxe MKLB4
Build Record
top and back: Coco Bolo
accents: Maple laminates
body core: Mahogany
neck: 3-piece Maple with 2 Purpleheart laminates
fingerboard: Ebony with pearloid oval inlays
pickups: AXY
controls: volume, pan, filter x2, Q-switch x2, mono output
finish: polyester gloss with Mark King signature decal on peghead
originally made for: WILS, Holland
birthday: August 19, 1988
There is one previous registered owner in Italy.
The bass was modified by Edwin Van Huik. A master volume control was installed and the electronics were converted to a 2 volume arrangement with an added pickup selector. There's also a note that there is an on/off with LED, but there's no other details about that function.