I used to have one of the guitar versions, the 36 fret EC-36.
The Basses are very rare ducks indeed especially in good condition, i have only seen one in my life and that was on ebay for all of a few days.
That one went for about $400. Whilst they are pretty rare, they dont fetch much money.
The official designation was Washburn Chicago series, B80 and B90, The B90 being the better bass, but both come with the stephens extended cutaway.
I would love to aquire one!
B80's
B90's
http://s251.photobucket.com/albums/g...ssP1000747.jpg