My first thought was this was a very heavily worn French 2, 5 or 10 centimes coin of Napoleon III (depending on the size). At least from the photo, I can't really discern any sign of "United States" on the reverse, though I faintly see a few indistinct letters.
My U.S. Type Set: https://www.NGCcoin.com/registry/co...sets/278808/
My U.S. Classic Commemorative Complete Set: https://www.NGCcoin.com/registry/co...sets/278741/
My 20th Century U.S. Type Set - Proofs only, No Gold https://www.ngccoin.com/registry/co...sets/396301/
My U.S. Classic Commemorative Complete Set: https://www.NGCcoin.com/registry/co...sets/278741/
My 20th Century U.S. Type Set - Proofs only, No Gold https://www.ngccoin.com/registry/co...sets/396301/