1960-1979

United States #1712-15 13¢ Butterflies Mint Se-tenant Block of 4

United States #1711 13¢ Colorado Statehood Mint Single

United States #1723 13¢ Energy Conservation Mint Single

United States #1724 13¢ Energy Development Mint Single

United States #1723-24 13¢ Energy Mint Pair

United States #1722 13¢ Herkimer at Oriskany Mint Single

United States #1708 13¢ Hopi Mint Single

United States #1720 13¢ Leatherworker Mint Single

United States #1721 13¢ Peace Bridge Mint Single

United States #1704 13¢ Princeton Mint Single

United States #1730 13¢ Rural Mailbox Christmas Mint Single

United States #1707 13¢ San Ildefonso Mint Single