Originally Posted by
headloss
A set of calipers and some measurements would tell us an awful lot.
You beat me to it.
We need: seat tube outer diameter (28.0mm French vs. 28.6mm English
Bottom bracket cup threads (35x1 French vs. 1.375x24 English vs. 36mmx24TPI Italian).
Seat tube inner diameter, from which we can compute frame tubing wall thickness and guess at frame composition
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069