The 'IoM' range of motorcycles was released by Bristol-based UK manufacturer Douglas to celebrate their famous win at the 1923 Isle of Man Tourist Trophy (TT). The Isle of Man TT is perhaps the most famous motorcycle race in the world, and is a form of time trial introduced in 1907. The race has several classes for motorcycles of different type and capacity. Tom Sheard won the 1923 Senior race on a Douglas RA. While this vehicle was never raced professionally, it is an early example of factory replica or tributes to famous racing motorcycles.