Hi Claus
I can tell you one thing, it is Japanese. With the "Matsumoku" marking on the headstock you can be sure of that!!
It looks similar to my PE-1000.
http://www.therathole.org/guitars/visit ... illbo.html But you say it is a bolt on. Can you get a photo of the entire guitar front and back? That might help.
By the look of the tailpiece/bridge (noble supermatic I believe they called it) It is probably 1980 model. I don't think they were using this in 1986 - - Neal, correct me if I'm wrong!
Bruce