1950s-70s USA and Russia philatelic covers that are related to the early satellites development, manned and unmanned spaceflights to the moon.
1970-09-12 USSR Luna 16
Luna-16 landed in the Sea of Fertility on September 20, 1970. It had two cameras of higher light sensitivity than Luna-9, with lamps and a wide lens aperture, since this mission landed at night. The artificial illumination failed, and unpublished panoramic images were reported having only a few light spots seen in Earthlight.