Keywords: Butterfly Checkerspot 13c 1977 issue U.S. stamp.jpg en Butterfly Checkerspot - Euphydryas phaeton - 13-cent 1977 issue U S stamp 1977-06-06 U S Postal Service; National Postal Museum http //arago si edu/category_2039149 html Butterfly Issue Bureau of Engraving and Printing Designed by Stanley Galli other versions PD-USGov Stamps of the United States 1971-1977 Commemorative stamps of the United States Butterflies on stamps of the United States Euphydryas phaeton 1977 stamps of the United States |