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@ofathens
Great, thank you @c00ps! So these are old American style BMX bottom brackets? It seems like there are some threaded ones and also pressed-in ones (https://www.sheldonbrown.com/harris/opc.html). Mad! I suppose I won't know exactly what it is until I buy it but replacements are possible. Also seems to be highly serviceable so maybe shouldn't be too worried.
I'm left wondering why there's a US BB shell on a retro British bike brand?