Also helpful -- original components, seat post diameter, bottom bracket diameter (cups marked 36(mm) x 24(TPI) indicate made in Italy, whereas 1.375(inches) x 24(TPI) indicate made in Japan. Shots of any surviving tubing stickers (Columbus, CrMo, Bianchi, tre tubi, etc.) help, as well.
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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