It is an SB-ELT/RSZ, like @mihangle says. It is broadly similar to the SB-Elite II and the SB-R80, but the ELTs are post-Matsumoku basses & were around from about 1989 - 1992. I've done a fair bit of research, as I have one myself. They're incredibly good basses & easily up to the standard of the earlier instruments.
There's been debate in the online Aria/SB basses communities for years about where these were from, & it's good to finally see one with a country of manufacture sticker - most of them have no markings whatsoever, so with no region or serial they're quite hard to pin down. We know model numbers & rough dates from old catalogues but that's been all up until now.
Anyway, gorgeous bass (mine is black, so much more dull!) & GLWTS!