I just bought some old hammers and the name on the hammer is almost worn to the point where you can't read it. It has a symbol on it that is an arrow head with either a four leaf clover in it or it may be a double D. If anybody could help with identifying it ,it would be a big help. It's dated 1941.

Can you post a picture of the mark?

This is the best I can get. I hope it helps.

I think I have found out what the markings are on my hammer. My wife did some research and I think they are Pennsylvania railroad marks.