Issued by the Soviet Union in 1970, this 4 kopeck commemorative stamp marks the 150th anniversary of the discovery of Antarctica by the Russian Antarctic Expedition of 1820. The design features the exploration ships Vostok and Mirny, commanded by Fabian Gottlieb von Bellingshausen and Mikhail Lazarev, set against a map of the Antarctic continent. A red banner above celebrates the historic milestone in Russian polar exploration, with inscriptions honoring the pioneering expedition that expanded the boundaries of human knowledge in the early 19th century.