Re: "Dutch" Ibanez Guitar
Matsumoku was a guitar factory; they would build guitars for anyone who ordered them and put any brand name on it that you requested. If a German (or any other) distributor wanted to have some guitars made that said "Dutch" on them, they could simply order them and receive them and go from there. In the same way a Japanese company would order guitars that said "Washburn" on them. It might be close to one of a kind (more like one of 20 or 30 or 100 though) in that it is that particular body shape and says "Dutch" on the headstock, but that won't make it valuable. It would be more valuable if it had a more famous name on it. There may also have been more than 1 distributor that chose that body style (from all of the available to be ordered styles offered at the time by the Matsumoku factory) for their run as well, you so you could possibly see this exact instrument with other names on the headstock. Again, I would guess this is a late 70's Matsumoku factory guitar, and it is worth the same as a comparable Aria Pro of the same period. This seems more like an Aria Pro than an Ibanez, though. Ibanez did not use the Matsumoku factory to my knowledge.