Philatelic cover, International Quiet Sun Year, paper, issued in Poland, 1965
Cover consisting of a single sheet of paper with an image of a radio telescope 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)'