Philatelic cover, International Quiet Sun Year, paper, issued in Poland, 1965
Envelope with an image of the sun in the lower left corner and three Polish stamps that relate to the International Quiet Sun Year. The stamps show the sun with planets and being tracked by a radio telescope.There are two postmarks, from Warsaw and dated 9 August 1965.
Two postmarks on front of cover, stamped in black ink '(asterisk) LAIA SPOKOJNEGO SLONCA (asterisk) / WARSZAWA 1. (asterisk) 9.VIII.1965 / (sun outline)'