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@retrodicorsa
These are English thread:
BSA is aka English (British Small Arms, used to make bikes with and without engines!)
English is generally 68mm though van be (rarely) 73mm. Italian is 70mm.
The 1.370x24 (diameter/thread pitch) confirm it.
That's a good price, Ribble don't stock Centaur but Veloce is >£12+
depending on postage of course!