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@deleted
"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."