Interestingly by 1920 most motorcycle manufacturers referred to their machines as motorcycles, BSA however were still using the term Motor Bicycles. Interesting? Perhaps not. Just something that stands out.
This is a very clean copy of a well illustrated parts book for the 1920 BSA V twin 6/7hp (770cc). And what more can I say except that it would be a bonus for any BSA v twin owner.
Click on the front cover below to see the complete 50 page parts catalogue.
It is a 8.6M PDF.