The Birmingham Small Arms Company Limited (BSA) was a major industrial combine, a group of businesses manufacturing military and sporting firearms; bicycles; motorcycles; cars; buses and bodies; steel; iron castings; hand, power, and machine tools; coal cleaning and handling plants; sintered metals; and hard chrome process.
At its peak, BSA was the largest motorcycle producer in the world. Loss of sales and poor investments in new products in the motorcycle division, which included Triumph Motorcycles, led to problems for the whole group.
A government-organised rescue operation in 1973 led to the takeover of remaining operations by what is now Manganese Bronze Holdings, then owners of Norton-Villiers, and over the following decade further closures and dispersals. The original company, The Birmingham Small Arms Company Limited, remains a subsidiary of Manganese Bronze but its name was changed in 1987.
In November 1919 BSA launched their first 50 degree vee-twin, Model E, 770cc side valve (6-7 hp) motorcycle for the 1920 season. The machine had interchangeable valves, total loss oil system with mechanical pump and an emergency hand one. Retail price was £130. Other features were Amac carburettor, chain drive, choice of magneto or Magdyno, 7-plate clutch, 3 speed gear box with kickstarter and new type of cantilever fork
