Here is a frame I am currently working on which is J and had the plastic head badge that only appears very briefly between 1953 and 1954. Posing in front of my totally unrestored Ladies Goldcrest (N, 1956) which is also Flamboyant Amoranthe the same as the TofB.
I have collected numerous 1950s BSA bikes and by studying catalogues and frame numbers I found a pattern. In the UK frame numbers in the 1950s stated with A and went up to P. Every other letter is missing. I have only ever seen bikes in the UK with A,C,E,G,J,L,N or P and a number. The noticible...