I had this soaking for 4 days in evapo rust and it came out ok, wish I took a before picture as it looked like a block of rust. Im thinking stone mason hammer. And the guy was proud of his work as he stamped it on both sides with G G K.
Would of loved to see before pictures. Great rescue, would of been a shame to let it corrode to dust. Plan on hitting anything with it or just hanging it up on a wall?