Issued in 1972, this 4-schilling Austrian commemorative stamp celebrates the IX International Congress of Municipal Economy held in Vienna from May 23–25, 1972. The design by A. Pilch and W. Seidel features the Vienna City Hall (Rathaus) framed by a bold modern motif symbolizing interconnected urban systems, set against a vivid red background. The congress focused on urban development, municipal management, and cooperation among cities. A striking blend of classical architecture and modern graphic symbolism, this issue is a highlight for collectors of Austrian civic and conference themes.