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''Basically the Merckx Colnago Mexicos (1974-1979) had round superlight main tubes, Sarroni Nuovo Mexicos (1980-1985) crimped top and down tubes, ESA Mexicos (1986-1988) had 6 ribs on main tubes, Zoetemelk Mexico SR/CRs (1985-1986) had a crimped top tube with a 4 rib downtube. FYI: Master with 4 ribs, Tecnos with 5 ribs, Conic with 8 ribs, and Regal (ESA Mexico w/Arabesque lugs) with 6 ribs. The visible difference between 1974-'79 Mexico and 1974-'79 Super is that the Mexico has chainstays that are not crimped at all (round-oval-round). FYI: Masi (round-D-round), De Rosa (round-diamond-round). Note that the timelines are for the USA.
It has been noted that there have been fake Merckx Mexicos which were actually Supers with chainstay crimps being filled in with automotive body filler and repainted. Repainted frames are usually fakes, damaged, or undocumented originals. Always start with the fake frame and let the seller prove it is real or undamaged and that it is not stolen. Most people cannot prove the provenance of their frames or their ownership and as such it is rare to see vintage/classic bicycles at auctions by the major auction houses. "
http://velobase.com/Forum/ThreadView.aspx?t=517