Hi peeps,
Is there any way to differentiate an Italian BB shell threading? Probably any signs or markings. Read similar thread from cyclingforum.com and only way to spot an Italian/British is by measuring the bb shell - Italian bb shell 70mm wide while British bb shell 68cm wide. Another way by looking at the bb cup markings which install on the shell.

What if there's no bb cup, just an empty frame set? Would be great if someone could share more infos on verifying vintage frame.

Thanks