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this one is also kind of close, but telling from the dropouts it was made in 1978 ( also the owner says late 70s)
https://www.pedalroom.com/bike/for-sale-my-viner-special-track-11236
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nothing. the only thing on the bb shell there s a tiny cross.
I know that in Viner you would usually find either stars or crosses. this cross looks more of a X thoughI dont think in the 1970 were doing already the cutouts like that.
The closer Viner I found to this frame is this onehttps://www.pedalroom.com/bike/viner-special-course-pista-12917
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https://www.lfgss.com/conversations/348642/#comment15326102
edit: sorry just noticed you need only the rear one. also not sure what period you re going for
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