Camshaft /dynamo chain, 110038, 38 pitch, endless, Renold, A&S, Nominal 3/8" x 1/4" 0.375" x 0.225". Renold are the original camshaft chain fitted to all Nortons twins from Model 7: 1949/55 to Commando. Original part number: D12/961 - dynamo drive chain 17806; 067689 - camshaft chain 06B1