This Polish stamp, issued in 1955, illustrates a coal miner operating machinery underground, symbolizing the nation’s industrial drive during the Six-Year Plan. The inscription highlights the ambitious production goal of 100,000,000 tons of coal, reflecting the central role of mining in post-war economic rebuilding. Designed and engraved by Czesław Słania, one of the world’s most renowned stamp engravers, the stamp carries a strong socialist realist aesthetic. Its deep blue-black tones and detailed industrial imagery make it both historically significant and artistically compelling. A must-have for collectors of Eastern European history, propaganda art, and industrial themes.