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BSA Piston NOS 4429 +040Blue Star 1934Compr. ratio 7,2:1with Gudgeon Pin and Piston Rings
Douglas Piston 500cc 1933-35 O.H.V
Douglas Piston +30 /Pair 600 cc 1927-
Norton Piston NOS 490cc 1931/48 +20
Norton Piston NOS 490cc 1931/48 +020
Norton Piston NOS 1948/54 490 cc +40 16H