A-10 These stamps are VERY RARE when they have the autograph of NASA Astronaut, US Senator, John H. Glenn Jr. shown on them. He was the first US Astronaut to orbit earth on 20 February 1962. The stamps have the US Postal Office numerical code, 27068 which enhances the value of this piece of space program history. He signed the stamps for McClelland following his return from orbit and arrival at Cape Canaveral, Florida on 27 May 1962. When Glenn passes on, it will gain much more value to collectors. Price: $6,500 firm.