This commemorative stamp from East Germany (DDR) honors the historic Vostok V space mission of June 1963, piloted by Soviet cosmonaut Valeri Bykovsky. The design features the Vostok spacecraft above a portrait of the cosmonaut in his helmet, symbolizing the achievements of early human spaceflight. The inscription records the mission duration from 14–19 June 1963, one of the longest solo spaceflights of its time. Issued during the height of the space race, this stamp reflects socialist bloc pride in Soviet technological success. It remains a notable thematic item for collectors of space exploration and Cold War-era philately.