Found this at a late 19th or early 20th century home yesterday with my XLT. It is about the size of a silver dollar, made of copper, and on the back has a hook at the top and what appears to be a belt loop on it also. Sorry about the blurry pic. took with camera phone. My partner found a chicken button from the 1800's and a 1940 Mercury dime. Had to watch out for a wild hog that had just left one of the houses we searched.