Hello everyone, i have just looked a bike that has come on eBay u.k. namely a 1970 bsa rocket three and i think i am right in saying that this model is the rarest of any three bsa/triumph cylinder bike. i believe that they built 167 of these but i might be wrong. does anyone know how many were built for 1970 and does anyone know the last engine and frame number for the 1970 mk1. cheers. billy.