Found this yesterday within 6 inches of a Fleur De Lis strap end and an 1853 large cent. It measures exactly 11/16 of an inch in diameter, has a number 30 stamped on it, and I think the word below it says SURE. There is printing around the rim, but it's to far gone to tell what it says. Blank and smooth on the other side, with no signs of attachments. It is also quite thin.. a tad bit over 1/32 of an inch.