I'm a volunteer at the Milntown Trust in the Isle of Man, which houses the Bob Thomas Collection, and includes a number of vintage cars and motorcycles. The motorcycles include Douglas and ABC, and there are many parts which we are trying to identify. Having had a few post war Douglas models, I can identify those, but we are struggling with anything that might be Douglas and pre war.
Amongst the parts are three frames (photos attached). Anybody recognise these as Douglas or any other make?