This striking Belgian semi-postal stamp, issued in 1958 for the Exposition Universelle et Internationale de Bruxelles (Expo 58), depicts the futuristic Pavillon Telexpo — a showcase of modern telecommunications. The bold architectural design, rendered in magenta and black, symbolizes post-war optimism and Belgium’s leading role in science and technology. The surcharge (“5F + 3F”) contributed to cultural and social initiatives linked to the fair. The design captures the modernist spirit of the 1950s and remains a highlight of Expo-themed philately.