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thank you for sharing this interesting mystery.

since it is an obvious respray we should be wary of placing too much weight on the presence/absence of braze-on bits.

here is an early eighties era Zeus Cyclery Corporation of NYC catalogue page showing the ROTO (Rampinelli) bottom bracket shell. apologies format not larger. will need to be enlarged a bit to see clearly.

as ever in these matters, we could use a word from member [MENTION=383399]MauriceMoss[/MENTION]...