Small collection of fuzes from the estate of an ordnance worker. Roller ball safety type for 20,37 and 57mm shells. Unmarked. No further info. Mellichamp says the 37mm looks like a project from the 30s. It is in a 1945 M16 AT gun case. Who knows ? There is a current US 20mm fuze which is similar. 37mm type is steel. All others are aluminum.