This classic Hungarian stamp, issued in 1965, honors Ignaz Semmelweis (1818–1865), the renowned physician known as the “savior of mothers” for pioneering antiseptic procedures in obstetrics. The design features a dignified portrait of Semmelweis in blue, with his name and life dates inscribed vertically at the sides. Denominated at 4 forint, it was part of Hungary’s commemorative issues celebrating national figures of science and medicine. A historical gem, this issue reflects both Hungary’s cultural pride and the international recognition of Semmelweis’ contributions to medical hygiene. A must-have piece for collectors of medical history, Hungary, or great scientists on stamps.