Trekvana and Bill. Thanks for the replies and info. I am not sure if this marking is just a W or a W.1. Can't find an answer to it in the books and am hoping someone more knowledgable than me might chime in. It is not one of those M1icon Hammers ground down to accept the dis-connector, got some of them, and they are completely different. A PI marked dis-connector was with it when I found it so that might be a clue. Wear and colour on both are compatible. Mike.