#1659-1668 Hungary - International Quiet Sun Year, Imperf., Set of 9 (MLH)
1965 - International Quiet Sun Year, 1964-1965, Imperf, Set of 9 stamps. Designs: 20f, Arctic exploration. 30f, Radar tracking rocket, ionosphere research. 60f, Rocket and earth with reflecting layer diagrams, atmospheric research. 80f, Telescope and map of Milky Way, radio astronomy. 1.50fo, Earth, compass rose and needle, earth magnetism. 1.70fo, Weather balloon and lighting, meteorology. 2fo, Aurora australis and penguins, arctic research. 2.50fo, Satellite, earth and planets, space research. 3fo, IQSY emblem and world map.