Issued by Belgium in 1928, this striking semi-postal airmail stamp (10c + 5c) features an early aviator in flight gear beside a biplane, symbolizing the nation’s pioneering role in European aviation. The deep maroon-violet tone and fine engraving evoke the spirit of exploration and technological progress between the wars. The surtax (5c) supported aeronautical or social welfare funds, a hallmark of Belgian charity issues. The example shown bears a Bruxelles/Brussel postmark dated April 1928, adding historical charm to its postal life.