Westone Thunder II fretless bass

Presumably (Like the fretted version) there are three (Possibly four) different versions of this bass 

Version 1 (1981-82)

Thunder II fretless bassThunder II fretless bassThunder II fretless bass headstock

Thanks to Mark Hillmer for these photos

Version 2 (1982)

22 fret active, P/J pickups - this version is the exact same spec as the later Thunder III (See the 1982/3 catalogue for full details)

Version 3 (1983 on)

22 fret 2 pickup passive bass (See the 1983 catalogue for full details)