AJS was the name used for cars and motorcycles made by Albert John Stevens & Co. Ltd, from 1909 to 1931, by then holding 117 motorcycle world records. The OHV 350 would be the mainstay of the company’s racing efforts until 1927 and in production form, was also AJS’s most popular sports motorcycle throughout the 1920s. Cyril Williams won the first post war 1920 Isle of Man TT Junior race on his 350, even though he had to push the motorcycle home for almost four miles after a breakdown.  In 1938, AJS became part of a group called Associated Motorcycles. After this Matchless and AJS generally shared models using different badging, although the AJS name was used for several unique racers. At the end of the 1940s and 1950s, the AJS Porcupine, a 500cc parallel twin, and the AJS 7R a 350cc OHC single, were being raced alongside their AMC stablemates the Matchless G50 and by 1951, the Matchless G45. The AJS Porcupine had been designed for supercharging, but Les Graham won the 1949 World Championship on an unsupercharged AJS500cc Porcupine.