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Campag certainly had thin cup variants, eg 3331.
I don't know if anyone else did, but everyone can't been on Campag.
I'd have a look at getting the threads cut deeper into the shell, likely less painful than trying to source an appropriate BB. Try Winston Vaz at Varonha.
Scilly.Suffolk
@SideshowBob
Ta very much @Scilly.Suffolk.
Do you know of any BBs that are more suitable for 70s frames with thin cups