Collection of United States Postal Service Space Exploration Collectors Stamps, 25 Stamps Mounted on Souvenir Cards; 7 separate cards, all in like new condition and wrapped in original packaging. It appears these were purchased at the World Stamp Expo 2000.Lot includes, 1) 5 - $1.00 stamps Exploring the Universe, 2) 1 - $11.75 hologram stamp Landing on the Moon, 3) 2 - $3.20 hologram stamps Escaping The Gravity of Earth, 4) 6 - $.60 stamps Probing the Vastness of the Universe, 5) 5 - $.33 stamps of Hubble Space Telescope discoveries, reverse is promotional for World Space Expo 2000, 6) 5 - $.32 stamps Space Discovery showing futuristic Mar's  colony by famed space artists Attila Hejja, and 7) 1 - $11.75 hologram stamp Space Achievement and Exploration World Space Expo 2000.