Issued by East Germany (DDR) to mark the 10th anniversary of the German Democratic Republic, this semi-postal stamp reflects classic socialist realism and Cold War-era ideology. The design features a worker-scientist holding a test tube, symbolizing industrial and scientific progress, set against the DDR flag and power station imagery. The inscription “Erbauer des Sozialismus” (“Builders of Socialism”) reinforces the state’s emphasis on collective labor and development. With a denomination of 15 + 5 Pfennig, the surcharge supported social causes, making it a significant example of DDR semi-postal issues. Highly collectible for themes of Cold War history, political propaganda, and socialist iconography.