ARGENTINA - ARGENTINA Republic. Gold medal, Aeroclub of Buenos-Aires, Grand prize of honour to Dieudonné Costes, winner of the South Atlantic 1927. Av. AERO-CLUB ARGENTINO / BUENOS-AIRES. Within a wreath formed by a laurel branch and an oak branch, a round cartouche with a flying bird in the foreground and a hot-air balloon in the background. Rv. Within a wreath formed by a laurel branch and an oak branch, engraved in five lines: GRAN / PREMIO DE HONOR / AL Tte DIEUDONNE COSTES / RAID PARIS-BUENOS AIRES / OCTUBRE 10-20-DE 1927. Gold - 31.35 g - 39 mm - 12 h Top Pop: this is the only graded example! PCGS MS63 (59843011). With owl hallmark on the hoop and 18 K on the edge. A tiny test mark on the edge. With a golden patina. Unique and historic! Superb. After Lindbergh's crossing of the North Atlantic in May 1927, in the favourable direction of the winds from New York to Paris, Dieudonné Costes wanted to try the opposite direction, but the venture was too dangerous and was halted by the Minister. With Joseph Le Brix as navigator, Costes attempted to cross the South Atlantic from Le Bourget to Saint-Louis in Senegal, then on to Natal in Argentina. This exploit earned them the Légion d'honneur and a triumphant tour of South and North America, and they were even received in the White House by Calvin Coolidge in February 1928.