It was in a pawn shop in L.A. a year or so back. The 400rb is from the late 80's, early 90's (it has the detachable power cord). There's a Los Angeles city inspection sticker on it dated 1992 ("This electriconic device has been deemed safe to use in LA city public spaces").
I'm not a latin/salsa type guy so I couldn't make hide nor hair of it...
It's always fun to try and decipher stuff like this.