A 1988 Polish commemorative issue honoring Hipolit Cegielski (1813–1868), the influential industrialist and founder of the famed H. Cegielski Metal Works of Poznań. The design pairs his engraved portrait with a detailed illustration of an early steam traction engine, symbolizing Poland’s engineering progress. Issued to mark the 142nd anniversary (1846–1988) of the metalworks factory, this 20 zł stamp appeals strongly to collectors of industrial history, machinery, and Polish heritage topics. Printed by PWPW and designed by A. Szczepaniak, it remains a notable late-communist-era industrial-themed issue.