Hey C&V, I have been reading for a while here about all the fantastic catches that people here have made, and I've been fortunate enough to come across a catch of my own. It's a Colnago Sprint from somewhere around the late 80's or early 90's by my best guess, as the same paint is found on the 1988 Super Chorus seen here: http://bulgier.net/pics/bike/Catalogs/colnago-88/16.jpg.
The only numbers stamped on the bike anywhere is the '53' stamped on the BB shell on the non-drive side. It has Colnago DO's and Mavic MA-40 clincher rims. Tubing is Columbus SL Cromor.
The bike is fitted with Shimano 600 throughout, and I doubt that the frame was ever built with this group stock, so if anyone knows what this frame might originally have had as a group, I'd love to know.