Old 11-14-11, 08:09 AM
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12 speeds indicates very late 1970s though to the late 1980s, depending on the level. As previously inidcated most Bianchi during this period have "B" or "Bianchi" stamped fork crown, head lugs and/or seat stay caps.

The serial number is the other key. It will be either on either the seat lug or bottom bracket shell. A seat lug S/N will be in two parts, one on each side of the lug. A S/N on the shell could have one or two parts.

The other thing I'd be sure to check during the visit is the diameter of the of the seat post. iIs the most reliable indicayor of tubing level.

As suggested by Bianchigirll, take lots of pics.
T-Mar is offline