Wonderful bike! Is that your L'eroica ride?
Slight thread derail, but what is the first crank?
The reason I asked, is that I have the same one on my hetchins (with panto colnago ring) that the original owner put on it from an old colnago Mexico....he swears it is campag, but there are no markings. He isn't the type to lie either!
It also has a colnago panto seatpin the same as yours :0)....from the same Mexico.