Collection of ten FDCs from the 1991 ‘Space Exploration’ series, all featuring 22-karat gold replicas of the stamps set against a red velvet backing. The series honors the exploration of all nine planets and the moon, including: Mercury (Mariner 10), Venus (Mariner 2), Earth (Landsat), Moon (Lunar Orbiter), Mars (Viking Orbiter), Jupiter (Pioneer 11), Saturn (Voyager 2), Uranus (Voyager 2), Neptune (Voyager 2), and Pluto (not yet explored). In overall fine condition. RR Auction COA.