Here's a picture of the bottom, this also looks weird to me the same sort of external cup crap. I've talked to my dad the original owner and he says he can't remember ever doing anything of the sort, but it was a long time ago (45 years) !!! I don't really care about replacing it, I've just had bad luck trying to replace headsets (I always get screwed on the size). Given that this is a 60's fuji, I'd probably be dealing with JIS, or given that it was a fuji made for the american market I'd probably need a ___ size? I'm totally cool with replacing the headset (It's actually not that hard). I know this may need to go in the mechanics forum.