This Colnago Mexico was Purchased in Los Angeles in 1976. Compagnolo
Super record components, Cenelli handlebars, etc. The wheels and tires are
newer clincher types -the originals were sew-ups.
There are a few articles in Wikipedia -here's part of one such:
By 1972 or 1973 the decals became more modern. Gone was the Comic-book
graphics, although the style was quite similar. A Clover with
"Colnago" written below on both the head tube and seat tube became the
norm. The downtube, I believe, just said "Colnago". There was a
special Eddy Merckx version during this period with fun pantographing
and an awesome drilled chainring. For details see the current book on
the Tour which contains a photo of Merckx next to a bike which is
clearly a Colnago. The regular version of the bike should be worth
close to $1,800, while the Merckx model maybe $2,200.
By the early 70's the bike boom was under way and Colnago pumped out
bikes as though the future of humankind was at stake. These mid 70's
bikes should be worth about $1,000. Note that interest in these bikes
is deep. It is well known that Colnago frames were built like - well,
let's not go there. More importantly, Colnago frames almost always
ride like a dream. That is more important. For that reason it is easy
to sell an older Colnago.
By the late 70's Colnago had even more frame varieties. We never could
figure out the difference between a Mexico and a Super. In fact,
everyone who tried to explain it to us has been contradicted by other
"experts". Mexico models, I believe, should have different chainstays.
Then again, the gold plated Mexico I once saw seemed absolutely
identical to a Super. I hope someone can help out with this!
Regardless, late 70's Colnagos should be worth about $900 or so, same
for early 80's examples. There were some nice looking examples in the
early 80's with crimped top and downtubes. They ride wonderfully,
although some had paint that peels if you look at it.