Need help buying an early 1980s Colnago
I'm talking with a guy selling an early 1980s Colnago. This would be my first steel frame and first vintage bicycle.
From the pictures, it appears to be a Super, though it may be a Mexico or Master - I'll know better when I look at it tonight.
It is my understanding that the Super has a rounded top tube, the Mexico has an indented top tube and the Master has a squared top tube, and that is the way to tell the difference.
Anyway, any advice you can offer on what to look for when purchasing old Colnago's would be appreciated.