Handmade sterling silver butterfly pin with bronze markings designed (c.1940's) and signed by Taxco, Mexico artist William Spratling (1900-67). 2 1/2" X 1 3/4". Two prong clip fastener works perfectly. Beautiful vintage condition. A larger example of this design is pictured on the cover of MEXICAN SILVER by Morrill & Berk and in WILLIAM SPRATLING AND THE MEXICAN SILVER RENAISSANCE also on spratingsilver.com. Marked WS SPRATLING SILVER MADE IN MEXICO.