Probably dating from the late 1800's and measuring 1 & 9/16" x 11/16" NBS Large, here we have an oval opaque blue glass button. It features a band of gilt paint on molded raised areas on each end. I looked at it under a loop to determine if it was a band of metal or not. I think it's just painted to look like metal. It has a 6-pronged brass rosette style shank. In very good condition with a minor bit of roughness along the edge. Nothing glaring. $18