Hi Steve,
The file for 12225 indicates it's a Signature Standard, the whole serial number is 99MJ12225. Here's the information in the file:
top: Flame Walnut
accent: Maple
body: Mahogany
neck: 3-piece Maple with Walnut pinstripes
fingerboard: Ebony with pearloid oval inlays
pickups: AXY
controls: volume, pan, filter x2, Q switch x2, mono output
birthday: November 5, 1999
originally made for: Bass Centre, London
That's all there is to report.
