those lugs are marked with the lug manufacturers logo, and it's Japanese...can't recall if it's Eisho or something else but somebody here might chime in before my brain cells do!
Anyway, there WERE Japanese Bianchis, and those would have BSC/ISO BB shell, but I don't think this is one of those...Bianchigirll will know better. I think it's another JP brand, but which one I sure don't know.
The serial numbers might be the best clue.

Edit: Looks like there might have been a brake-hanger arch brazed on the seatstays that has been ground off, that's one thing that Volpes had, and Volpes had a unicrown fork, but not sure about any of the other features....this is one for Bianchigirll!