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@de_Selby
I've got a 67mm BB shell on my 1980 Carlton Pro-am. Thread is definitely 24tpi and I've fitted a Shimano UN54 110 mm BB in there. Chainline isn't sorted yet as I don't have a hub (still building), but my LBS - who are fixed-friendly - measured it up and said it would be OK. I know my BB shell width is different to yours but just letting you know the Shimano BB will fit the threads and comes in different lengths. Dunno if this helps any...