This commemorative stamp marks 20 years of the 1943 Treaty of Friendship, Mutual Assistance, and Post-War Cooperation between the USSR and Czechoslovakia. The design features the Soviet and Czechoslovak flags, symbolic state emblems, and landmark architecture from both nations: Moscow’s Kremlin and Prague’s Hradčany. Printed in a bold palette of red, blue, and sepia, it reflects the political unity and socialist solidarity of the era. A significant Cold War–period issue, it is popular among collectors of Eastern European history, political relations, and Cold War philately.