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« on: 21 February, 2019, 11:13:15 »
The first B40F bikes left the factory in September 1964 and were 1965 season bikes, but at the same time some pre "F" bikes were still being exported.
The BSA year seasons usually started in August or September but sometimes the new season bikes were delayed (the worst case of delay probably being the 1971 season bikes)
Starting the season in August/September also allowed BSA to get the new season bikes in quantity to dealers in the all important USA market for the peak selling season which, over there, was in April May and June.
The "C" numberplate, if it was an original one not an age related plate, would relate to the date the bike was registered, not the date it left the factory. Some bikes remained in dealers stocks for some time after they left the factory before being sold(my own A10 left BSA in May 1961 but was not registered until March 1962)