Bar pin of underlying metal of silver with gold plating Turquoise guilloche enamel in rows separated by gold metal. Mechanically cut lines on the metal under the transparent enamel. There is a round hinge and wider c clasp. The pin stem extends beyond the c clasp. F&B stamped into the back, for Foster and Bailey; an American company doing business between 1878-1898 and 1898-1951 under a different name but same hallmark. 1 1/2" long `1/4" wide