A SMALL ENAMEL BROOCH OR PIN BY THE ROBBINS CO. Attleboro, Mass. Circa 1930s. Stamped on the back THE ROBBINS CO./ATTLEBORO, MASS./PAT 2066969. Measures 1/2 inch in diameter. Hinged pin on back. A circular pin with green and white enamel. The white enamel is formed as conjoined W's.