Originally Posted by
sailorbenjamin
Motobecanes are SWISS thread. Just like frenc but one of the cups (the fixed one?) is left threaded. Keeps it from loosening itself.
Spindle should be the same.
I'd guess a 1977 would be French. At some point Moto switched over to Swiss threading, but I'm pretty sure that's later. My 1979 is French at any rate.