This is a factory issue knock-off hammer. The head is a combination of cast iron for mass and copper faces for impact strength with minimal damage to chrome winged hub nuts. The head is stamped with large number 1. Total weight is 1-pound 14-ounces. This type of hammer would be used for wire wheel cars and for Twin Cam or Deluxe cars with knock-off steel wheels.

Jim Cheatham in Amelia, VA, USA found this vintage THOR hammer Size 1 REF 310 and decided to restore it. Thor Hammer Company is still in business.