Misshapen Copper - bullet?

[Bramblefind]

Found this on the side of a country lane that has been in use since just after the Revolution. It is about 1 inch in diameter. Has the green coating of aged copper.

I thought maybe it was a flattened or melted bullet? But I showed it to an archaeology professor who said it was not -though he didn't know what it was.

It is heavy for it's size and solid.

Thank you

 

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[Tony in SC]

Looks more like a big rivet. Tony

 

[Bramblefind]

Aha! Thanks for the rivet idea. Found this - which looks in the ballpark for a possibility: