Issued in 1973, this commemorative 0.40-franc stamp honors the 50th anniversary (1923–1973) of the Eternal Flame beneath the Arc de Triomphe in Paris—a powerful national symbol dedicated to the Unknown Soldier of World War I. Designed by Durrens, the stamp features the monument in fine engraved detail, with stylized tricolor flames (blue–white–red) rising at its center. The combination of deep violet shading and bold tricolor motif gives strong visual balance and patriotic expression. A notable issue for collectors of military history, memorial monuments, and French national commemoratives.