O.K need some help.......

[randall61]

found at a site I,ve pulled miniballs & other relics early 1900s.....its heavy for its size,a nickel for comparision.On the bottm it has a hole about grapeshot size & some kind of sunk in design on top.it appears to be iron.
any ideas?

thanks Randall

 

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[snook]

Cannon part? Breech part?