Originally Posted by
Otis
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.
The braze on Bottom bracket shift cable guides by Campagnolo were in limited use but production in 1970. I do not have my Campagnolo catalogs nearby, but they might have been listed as early as 1968. You are correct that changes like this were slow to be adopted. Back then, it was the trade shows where items were presented to the public and other builders where the cross pollenating would happen.
Earliest recessed brake mounting I have seen was 1976. But back then it was RARE.