My previous post led to the following Speedwell titanium serial numbers
173010 Charles Young PR273020 Ken Denny PR1273008 Ken Wallace PR1174016 Stefan Schaefter of Speedbicycles (thanks to Marc St Martin for p ointing out these bikes to me) PR1074014 Mine 67706 Stefan of Speedbicycles
Charles Young suggests, and this seems to work well with these S.N.s, that you should read month/year/Nth bike produced that month ie PR1273008 would be December 1974, 8th bike produced that month.
Alexander March Bordeaux France
PS : I have one photo showing Ocana in the 73 TdF riding a Speedwell, origi nal polished finish, so NOT repainted Bic orange as I have read in several past posts to CR.