1950s-70s USA and Russia philatelic covers that are related to the early satellites development, manned and unmanned spaceflights to the moon.
1966-11-07 USA Lunar Orbiter 2
On 6 November 1966, Lunar Orbiter 2 headed for the moon and in lunar orbit on 10 November. Excellent pictures of potential Apollo landing sites in particular were returned.
Lunar Orbiter 2 took over 800 pictures during its mission, including an oblique view of the crater Copernicus that was voted one of the best images of the century by the press. It was deliberately sent crashing into the lunar surface on 11 October 1967, bringing to an end the successful mission.