Look at bulgier.net for the olmo catalogs...the competition was Olmo's bread and butter line. They made several grades of bike using different parts and, sometimes, tubing. I don't know about the Mexico tag, but during that timeframe Mexico was the place to go to set the hour record (probably still is, but the UCI has screwed up the rules so much it seems that no one wants to pursue it any more). For instance, Colnago Mexico was a special road bike that was considerably reworked for lightness (special tubing, parts whittled to nothing). Maybe the Mexico moniker indicates that?