This 1965 commemorative stamp from the United Kingdom honors the centenary of Sir Joseph Lister’s groundbreaking work in antiseptic surgery. The design features a striking blue portrait of Lister, symbolizing his scientific legacy, alongside a classic monochrome vignette of Queen Elizabeth II. Issued during the pre-decimal era, the 1-shilling value is part of a key medical-history set, highly regarded for its clean modernist layout and thematic significance. A notable issue for collectors of medical philately, British commemoratives, and QEII-era postal history.