...hammer. I know it's not a hot rod part or even a hot rod tool but I was going through my grandpa's tool box again and this was laying in the bottom. Never noticed the marking before and thought it's kinda cool. Grandpa was a mechanic and worked in Hollywood durning the '20s and 30s at the White Garage and was at one time Ken Maynard's personal mechanic. Maynard was cowboy star. Don't know if this hammer dates that far back though?