This past weekend I found what appears to be an iron ball weighing .630 pounds (10.1 oz) on a digital kitchen scale. The diameter of the ball is 1 11/16 inches. This item was found very shallow, maybe 5 inches, in Medford, NJ. Research on the web leads me to believe that it is possibly a canister shot from an 18 pound canon. I welcome any and all opinions, thanks.