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If you have an early 80s one, it's going to be a bit of a task finding out what it is. They transferred from French to British threads with a small period of Swiss around that time. Below is a pic of the Swiss one (according to the cyclespeugeot site!). You can see the line on the fixed cup that I mentioned...good luck!
dirac
AlexD
Cheers, ill check that out when/if the site comes back up. Ill check the bb tonight i hope its not too obscure to get hold of.