Extremely Rare Genuine BSA M20 . 500cc SV . , M21 600cc SV . ..1947 book... with the almost impossible to find Lubrication chart still attached ... This original Owners Instruction Book is in almost immaculate condition .( not quite , but it is 79 years old !!) . You will not find another as tidy anywhere . . Don't miss out ... these are rare to find ..
