1911 P & M 3½hp
Built by Phelon & Moore in Cleckheaton, Yorkshire. In 1924 the first P & M Panther was produced, and later bikes are better-known by this name.
Note the sloping cylinder used as a front frame member (the tube running down and under the engine is the exhaust pipe) - this was a feature of nearly all P & M machines right up to the last Panther in the sixties.