The first Royal Enfield motorcycle was built in 1901; the original British concern was defunct by 1970. The Enfield Cycle Company is responsible for the design and original production of the Royal Enfield Bullet,. In 1914 Enfield supplied motorcycles to the British War Department. During World War II, The Enfield Cycle Company was again called upon by the British authorities. One of the most well-known Enfields was the Royal Enfield Flying Flea, a lightweight 125 cc motorcycle designed to be dropped by parachute with airborne troops. In 1948, a groundbreaking development in the form of rear suspension springing was developed and this was soon offered on the Bullet 350cc. A 500cc version appeared shortly after. A 1950s version of the Bullet,it’sjigs ,dies and tools were sold to India, where developed versions continue to this day. It is the longest-lived motorcycle design in history. In 1949, Royal Enfields version of the parallel twin appeared. This 500cc version was the forerunner of the 700cc Constellations. The 700cc Royal Enfield Constellation Twin has been described as the first Superbike.