This striking 1961 Mongolian stamp set commemorates the 40th Anniversary of the Mongolian Postal Service (1921–1961). Each design depicts traditional means of transport across Mongolia’s vast steppes and mountains — a yak, reindeer, horse, and camel — symbolizing the resilience of the nation’s communication system. Issued in vivid colors and featuring Mongolian script alongside the denomination in möngö, the stamps blend cultural heritage with modern postal progress. The 10 möngö airmail stamp highlights the transition to aviation, while the others honor the endurance of traditional routes.