This was a variant of the RB999, apparently only made for the European and Japanese markets. It has a single big humbucker (similar to other Roadstars) with 16 exposed polepieces, and simple passive electronics.
Compared to the RB999 or MC888, it does not have the same curved front, but has a flat front with a bevelled edge both front and back. I believe it came only in one finish, a metallic black/grey. The back of the neck is simple clearcoated maple, the front of the headstock matches the body.
I have not seen this in any Ibanez catalogs of the period, but it's popped up on some Japanese-language websites belonging to some collectors / vintage dealers. It's possible it was designed to fill in a lower price point in the 'bean bass' line, or was just an unlisted model created to use up remaining body blanks?
I know this cos I have one, which I got from a former American serviceman who had been stationed in Germany during the 1980s; it still has a sticker of the German music store where it came from on the back of the headstock. (Gotta love Craigslist!)
You can see that it's an RB666 from the Sting video: there's only one pickup on the bass and that the edges are bevelled (they catch the light), and when you see a reverse angle, the neck is unfinished.
Hey who knows, maybe I have Sting's old bass...
