It can really only be a Nuovo Mexico, as only that model and the Profil had the channeled tubing, and yours lacks the aero fork that the Profil had. That makes it 1983-86. The other frame details have to do with where it falls in that time frame. I'd guess it's post '83 and maybe falls in the latter part, but there's no good chronology. The Esamexico was introduced in '87 and had more shaped tubing, which yours does not appear to have - that model took its name from the Italian for "hexagon" - "esagono," which described the tubing shape. So from what I can see, it can only be a Nuovo Mexico and nothing else. The other frame details point to that '83-86 period as well.