BSA's rugged, workaday B31 was manufactured from 1945 to the end of 1959, its overhead-valve engine providing the basis for the renowned Gold Star sports roadster. At the time of its introduction, the B31 was BSA's sole all-new model, joining the lightweight 'C' and heavyweight 'M' ranges carried over from pre-war days. Produced initially with rigid frame and telescopic front fork, the B31 gained (optional) plunger rear suspension in 1949 and an all-new swinging-arm frame in '54. A good all-round performer by the standards of its time, the B31 could cruise comfortably all day at 60mph while returning 75-plus miles per gallon, virtues that endeared it to private owners and police forces alike. An ex-police model sold into private ownership in 1974, this B31 comes with its original logbook recording the Secretary of State, Home Office as first owner. Restored at date unknown, the machine is offered with old/current Swansea V5/V5C documents and a quantity of old tax discs and MoTs (most recent expired April 2006). The machine will require re-commissioning before returning to the road.