It has the De Havilland inspection stamps on the blade butt, so I would tend to believe it to be a De Havilland propeller blade. It is a left hand rotation blade so that is the direction of rotation for a Dove. But the rotation would not be correct for a RR Merlin powered aircraft like a Spitfire or Hurricane. The blade is missing the steel bearing races on the butt of the blade which are installed during the forging process, so this blade could never be flown again.