BSA motorcycles were manufactured between 1910 and 1973. During the second decade of production, it was consolidated as one of the largest brands in the world. It had an important role during World War II producing motorcycles for the British Army, most notably the BSA M20. During the 1950's the brand achieved its golden era with iconic models such as the BSA Gold Star. It was until the 1960's that the decline started because of Japanese competition. In 1973, BSA closed its motorcycle division and was absorbed by Norton-Villiers-Triumph.