That's what I was thinking too Tony, possibly a foreign coin having the stars or dots around the edge. Maybe after the cleaning it'll be easier to ID it.Three cent nickels are larger than that. They are 17.9mm in diameter, the exact size of a modern dime. Also, your coin appears to have stars around the edge, three cent nickels do not have stars on them.
To my eye, your find is either a foreign coin or some kind of token. Are there any details on the other side of it?
Clean it well it could be a copper alloy wick turning wheel from an old lantern , these commonly break off and resemble a small coin or maybe even a small cuff button without its shank or loop.
Clean it well it could be a copper alloy wick turning wheel from an old lantern , these commonly break off and resemble a small coin or maybe even a small cuff button without its shank or loop.
I have to agree that it is not a III cent. Dan's idea of possibly it's a wheel to raise the wick of a lantern makes sense to me.