6 STAMPS :
ESSA 8: 15 Dec. 1968. 1st Weather Satellite Nasa linked to 50 countries of the O.M.M..
ECHO 1: 12 August 1960. 1st telecommunication Satellite, reflexion of the radio waves on the surface of a huge (40m diameter) inflatable metallic balloon.
TOPEX POSEIDON: 10 August 1992. 1st European Satellite to study oceans, launched from Kourou on Ariane rocket, flight number V52.
DIADEME 8: 21st French Satellite of geological study, with on board laser reflectors. Launched from Hammaguir (Sahara) by a Diamant rocket.
EARLY BIRD: 6 April 1965. 1st business communication Satellite located between Europe and USA in geostationary orbit.
MOLNYA 22: 22 August 1964 1st Soviet telecommunication Satellite highly excentric orbital path which alternately cover high and low orbits.