This is neither a serial # or a Bianchi, but still this seems like the best place to ask this question since @
T-Mar & @
Bianchigirll and other knowledegable folks frequent here. The Torpado I'm working on right now has a 63 stamped on the bottom bracket and I've seen 73 stamped at the top of the head tube of my Raleigh Grand Prix. Any idea what these numbers signify?
