If you can send me a photo of it i am certain that it can be dated to within a few years. BSA was incorporated in the chainwheel from 1908 onwards so the chainwheel at least dates from pre that year. But there are several different patterns that predate this and I cannot tell without a drawing or photo. Regards Hilary Stone
Rolf Lunsmann wrote
> 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.