This 3d stamp from the United Kingdom, issued in 1965, commemorates the opening of the iconic Post Office Tower (now the BT Tower) in London. Designed in a striking modernist layout, it features a gold-toned illustration of the tower contrasted against cool blue panels and a refined portrait of Queen Elizabeth II. Printed by Harrison & Sons Ltd., the stamp reflects the era’s technological optimism and the tower’s role in advancing national telecommunications. A desirable item for collectors of British architecture, QEII issues, and mid-20th-century engineering themes.