A striking 10-centavos blue stamp issued by Chile in 1940 to mark Decree No. 1747 (6-XI-1940), which formally asserted Chile’s territorial claim over Antártica Chilena. The design integrates a polar projection map of Antarctica with a flowing banner featuring verses from “La Araucana,” Canto I, the epic poem by Alonso de Ercilla y Zúñiga (1533–1594). Printed by the Casa de Moneda de Chile, this issue is prized for its historical significance, literary reference, and bold geographic artwork. A desirable early Antarctic-claim thematic item for both Chile and polar-philately specialists.