About 1960.It was made.
250 cc four speed box.Bought a few years ago unseen for engine.So I could put it in another DOT motor cycle.
Its a very rare DMW trials bike.Not seen another one.
DMW made quite a few Machines...One was a Police Type scooter with all the radio gear Etc.
Keep seeing one. At one of our local shows.
Thanks Mark for digging photo out....