Vincent Motorcycles was a British manufacturer of motorcycles from 1928 to 1955. The business was established by Philip Vincent who bought an existing manufacturing name HRD, initially renaming it as Vincent HRD, producing his own motorcycles as HRD did previously with engines purchased as complete assemblies from other companies. From 1934, two new engines were developed as single cylinder in 500 cc and v-twin 1,000 cc capacities. Production grew from 1936, with the most-famous models being developed from the original designs after the War period in the late 1940s. The 1948 Vincent Black Shadow was at the time the world's fastest production motorcycle. The name was changed to Vincent Engineers (Stevenage) Ltd. in 1952 after financial losses were experienced when releasing capital to produce a Vincent-engined prototype Indian (Vindian) for the US market during 1949. In 1955 the company discontinued motorcycle production after experiencing further heavy financial losses. History Vincent Motorcycles, "the makers of the world's fastest motorcycles", began with the purchase of HRD Motors Ltd less the factory premises, by Philip Vincent in May 1928. HRD was founded by the British Royal Flying Corps (RFC) pilot, Howard Raymond Davies, who was shot down and captured by the Germans in 1917. Legend has it that it was while a prisoner of war that he conceived the idea of building his own motorcycle, and contemplated how he might achieve that. It was not until 1924 that Davies entered into partnership with E J Massey, trading as HRD Motors. Various models were produced, generally powered by J.A.P. engines. Although HRD motorcycles won races, the company ran at a loss. In January 1928 it went into voluntary liquidation. The company was initially bought by Ernest Humphries of OK-Supreme Motors for the factory space, and the HRD name, jigs, tools, patterns, and remaining components were subsequently offered for sale again. Phil Vincent Philip Vincent was advised to start production under an established name. He had built a motorcycle of his own in 1927 and in 1928 had registered a patent for a cantilever rear suspension of his own design. With the backing of his family wealth from cattle ranching in Argentina, Vincent acquired the trademark, goodwill and remaining components of HRD from Humphries for £450 in 1928. The company was promptly renamed Vincent HRD Co., Ltd and production moved to Stevenage. The new trademark had The Vincent in very small letters above the large