Originally Posted by
boardwalk
If I remember correctly from when I had a '62 Specialisima, the first number is where it is in Bianchi's line up with #1 being the top and so-on down the line and the second number would be the second digit of the year i.e. 2 for '62, 3 for '63 and so-on. My Bianchi also had the cool integrated headset like that one but much nicer and chromed. So I'd guess from the '60's or earlier.
That is not consistent with my experience.
1962 low-end Bianchi Corsa, bottom of their road bike line: 2F51703
1981 mid-grade Bianchi Campione d'Ialia, made in Dec 1981: 1M9914
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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