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Italian BB makes sense, There's an overall Italian vibe to the frame, but there were so many small local framebuilders in italy bitd that it may prove tricky to id
The fork panto is as good a place as any to start - I wondered whether it might be Rivoli but theirs is different. If you can ID that fork panto you can see if the serial# matches up.EDIT: Just checked Rauler too, I don't think they ever had a panto like that either
looks like you have a panto on the fork crown... do you think it's an original fork? if so, put up a photo and that may help id it.
Other useful bits of info include BB thread - BSA, Italian, French and the seatpost size which will give some idea of what tubing you've got - Seatpost is usually marked with size so it's fairly easy to check