This is one of a set of 18th c. buttons featured in the Big Book of Buttons and said to be the designs of Wedgwood. The decoration appears to be paint, so its survival is miraculous. I have wondered if the designs were painted in slip which could explain its durability. It would be like Wedgwood and Boulton, both innovators, to try firing ceramic clay on copper. At any rate, they are hard-to-find buttons! This one is in very good condition. It has a surface flaw, but otherwise, the finish is mirror-bright. It measures just a hair under 1 & 1/2 inches.