There's not much Musician left here, probably only the neck section and the bridge. I've seen the auction, someone posted the link on a Dutch bass forum. It's been horribly mutilated. I think it was originally a mid 80s MC824, as it appears to have a rosewood fingerboard and is routed for two humbuckers. In original condition, it would have looked like this:
If the fingerboard IS ebony, it's an MC924 from that same era, which would have looked like this:
As far as I know, there was never a lefty version of that model. Only the 1980-1983 models were available lefthanded. I think someone has cut off the body wings, glued on some new ones and gave it its current bodyshape. The shape of the electronics routing looks nothing like that of a Musician, so I really couldn't imagine this is the (remains of the) original body.