S1 Publishing(Oxford)© 2015

World of motorcycleS
S1 Publishing(Oxford)© -2015
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B.S.A. 3.5 H.P.

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Although I try my best to identify each models, I can not guarantee they are correct.
I will say this though, this was not listed in the UK wikki list of BSA mchaines, but neither are the round tank BSA's either.