Originally Posted by
bikingshearer
I'd especially look for the "wolf ear" head tube lugs, which appear to have been discontinued in 1960. I can't tell from your photos if yours has them or not.
The blue background on the headbadge (assuming it is original) indicates its the 56mm version, pretty much pegging the bike no later than 1958. Could be as early as 1951. The lozenge decal disappeared after 1955, but without it, Cinellis look the same.
Nisi is probably the easiest of rims to find. They ones with the serrated bake walls were made in the 50s and 60s, so there are "lots" of them out there. Fiamme and Mavic would be the next "easiest". I personally disagree with the OP in the Fiamme thread. I don't think option #3 was available in the 50s. You can find the Weinmanns in Germany. Early Ambrosio rims are pretty tough to find outside of Torino.