I will surely edit that post, @Bassassin, if what I said was incorrect. As I said over there, I spoke to somebody at a Vintage Guitar shop in Tokyo, who does appraisals for a living, and he said he believed it had been made at Matsumoku. He said Aria used to use various different logos, and he attached this photo from a Reverb post.
Should I assume he has no idea about what he's saying?
It's not that 'I don't like to be told my instrument's not what they want it to be', believe me. I am a professional keyboard player who has been playing bass for 2 months. I don't know anything about MIJ 70-80s basses, other than I like them. I just assumed that what I was told by a professional was more likely to be correct than what somebody I know nothing about said on a forum. Does that sound understandable?
It's actually very simple.
And again, I thank you very much for your help!