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@dwscrimshaw
Yes, this is a 68mm BB. I am relatively happy to leave it a bit vague. I am reasonable convinced it it RT not least because any other leads go nowhere. I think the 70,s catalog all show normal bolted rear caliper. So again looks like 80's. I have not seen a RT cat for the 80's and believe it was more bespoke by then. I'll leave a bit of a question mark on this one and see if anything else turns up, in mean time I'll put RT decals on.
Fortunately the lo-pro has a very distinctive seat stay attachment which Tom identified as one of his. There are several similar ones, but the small pad was the give away.
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