If it's an Aria Pro II, 1970 is way off (as Mfukuyama has indicated). I would guess it is an ST Stagecaster (not to be confused with Stagemaster). If it is an LEG Legend then it could only be a 1987.
Most everything I have here indicates the Stagecaster had black logo and larger "curvier" headstock and the Legend had a smaller more angular headstock with spaghetti logo.
Either way it was built by Matsumoku. I have heard from several sources that Matsumoku was building for Shiro Arai Co. even before the Aria Pro II line was launched. I have contacted several individuals that were part of Matsumoku through a translator and hopefull I will be able to tell a little more of the story if they are willing. I will probably have to update a few pages though.