I have seen Colnago Sprints on the net, reported to be from 1987 which have a more modern tubing decal with the more simple "COLUMBUS" typeface that came later: https://www.flickr.com/photos/9609346@N03/sets/72157626504606793/ and especially https://www.flickr.com/photos/9609346@N03/4547820240/in/album-72157626504606793/
And http://www.retrospectivecycles.com/colnago-sprint-52cm/ is from 1986 and has the seatstay stamping.
So it must be 1985 or older? (or the '86 above is a super sprint)
@jetski started
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I have seen Colnago Sprints on the net, reported to be from 1987 which have a more modern tubing decal with the more simple "COLUMBUS" typeface that came later:
https://www.flickr.com/photos/9609346@N03/sets/72157626504606793/
and especially https://www.flickr.com/photos/9609346@N03/4547820240/in/album-72157626504606793/
And http://www.retrospectivecycles.com/colnago-sprint-52cm/ is from 1986 and has the seatstay stamping.
So it must be 1985 or older? (or the '86 above is a super sprint)