I would like to thank Hillary Stone for the dates of Williams parts and also ask her or any one else who might have the info on dating B.S.A. parts? I would particularly like to date the cranks and chain rings? In regards to the dates on Williams components I have a crank and chain wheel both marked williams but I can't find and date codes on either piece? THANK YOU...........GIAN BONGIORNO..IN L.A. CA.