Boston & District Motor Cycle & Light Car Club Car Badge
UK District Clubs, B
92 mm (3.6") diameter. Manufactured in Alloy. Affiliated to the Auto Cycle Union (A.C.U.) East Midland Centre 1925 and again in 1950 Known to be affiliated to the Royal Automobile Club (RAC) in 1987 but my records are far from complete. I would put this badge at around the 50's.