What I see- but this is probably of marginal use-

dimples at chainstay sockets at BB- used to locate, hold tubes during mfg. a production line frame, think carousel.

stamped front derailluer braze-on - before 1985 in my observation. When the superior investment cast parts came in, those went away fast.

some of the brazing is quick and messy- might be a very strong joint but speed was the grail.

under the BB cable routing early 80’s onward.

i doubt Italian.