1952 NSU Fox 1952 NSU Fox NSU had introduced the Fox in 1949, as the Fox 4 101 OSB with a new post-war design and 98cc ohv engine. In 1951 The Fox 2′ was added; it was a Fox 4 with a new 123cc 2-stroke engine. The Vincent-Fox was the Fox 2 model with the 123cc 2-stroke motor. The Fox went on sale in Britain in 1955, but the timing was not good for launching a lightweight motorcycle. The market in 1955 was dominated by the latest motoring marvel - the moped. Only 40 were built.