Prototype of first US dollar coins going up for auction

A piece of copper that was struck by the US Mint in Philadelphia in 1794 and was a prototype for the fledgling nation's money will go up for auction Friday.

Prototype of first US dollar coins going up for auction
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A piece of copper that was struck by the US Mint in Philadelphia in 1794 and was a prototype for the fledgling nation's money will go up for auction Friday.