Lots of variables but most high end Italian frames used no braze-ons until the early-mid 70's.

I've been told the Campy braze-on cable guide for the BB shell was introduced around '72, but many builders continued to use clamp-on's.

I think shifter boss braze-on's were not real popular until about '74, and top-tube cable braze-on's although available through the mid 70's did not seem to become really standard until about '78-'79.

Front derailleur tabs would be more like a post '83 thing for most of the big builders.

Brakes went from nutted to recess style around 1980 or so.

Of course that is all very general and does not account for all the small custom builders and special orders.