Originally Posted by John E
T-Mar and I are still trying to figure out Bianchi's serial numbering system.

What era Bianchi are you trying to figure out?
The early '60s Specialissima serials seem to start with 16x.... with the "x" being the year date. I have one starting with 164.... that I'm quite certain is a '64 model. Other than those early '60s #s, I know nothing more about how Bianchi went about it.