I believe Supers had the inside of the chainstays crimped, while the Mexico s did not, at least the in the 70s.
And I agree that from the time Colnago started using braze-on top tube ca ble guides (1975-ish ?), there were only two regardless of the model.
Ray Dobbins
Miami Florida USA
From: brad stockwell <brdstockwell@yahoo.com> Subject: [CR] Colnagos: 2 top tube cable guides To: classicrendezvous@bikelist.org Date: Thursday, March 5, 2009, 4:28 PM
In my experience all the Colnagos have 2 cable guides and not three.
If memory serves, the only visual difference between a Super and a Mexico was the "mexico" label on the chainstay. I have a BikeCology ad showi ng the two, from '78, I'll dig it out and post it.
When I see a Colnago with 3 cable guides, I figure additional forces were a t work there.
Brad Stockwell
Palo Alto CA USA