A striking 1966 airmail issue from the Republic of Congo promoting the Europafrique cooperation concept, symbolizing development through shared scientific and agricultural progress. The bold design features a stylized atom, golden radiating lines, a map of Europe and Africa, and a green wheat motif—representing unity, technology, and food security. Printed by Delrieu from artwork by Claude Haley, this 50F high-value airmail stamp is popular for its modernist Cold-War-era aesthetic and strong thematic appeal. A desirable piece for collectors of Pan-African themes, development politics, and mid-20th-century airmails.