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Rocket Mail of the WorldPolandKrakow, Poland %u2014 July 22, 1963 %u2014 EZ-4C1 %u2014 Krakow Aeroclub.Cover with souvenir sheet of four rocket stamps, with four stamp styles, imperf.(purple rubber stamp) 1963 Rocket Post.(souvenir sheet border) Aeroclub Krakow, Rocket Flight of the Rocket Experimental Center, 1963.(return address on back) Polish Philatelist Association. Krakow Branch. Kolo No. 27 Miastoprojekt. (serial number on back) 005350.
