Can anyone help me to date a BSA chainwheel ? It is a five pin chainwheel for 1 in pitch, skip link, chain. The chainwheel does not have BSA lettering in its pattern but it does carry the BSA name and symbol. The outer face of the wheel has the number Rd 310844 and the inner face carries French and German patent numbers. The chainwheel is from a fixed wheel bike that has been restored and is currently being reassembled. Dating the chainwheel would give me some idea as to the age of the bike. I suspect that it may be from about 1910 or the 1920s. The other components on the bike include Dunlop Welch 28x1 1/2 rims and a Philco centrepull brake. Most of the other components are Brampton.
regards
Rolf Lunsmann