This commemorative 100-escudo stamp was issued by Chile in 1974 to mark the 100th anniversary of the Instituto Hidrográfico de la Armada (1874–1974). The design features a finely engraved portrait of Francisco Vidal Gormaz, pioneering hydrographer and key figure in Chilean naval cartography. Printed by Casa de Moneda de Chile, the stamp also displays the official Hydrographic Institute emblem in blue, symbolizing Chile’s maritime legacy. A desirable thematic item for collectors of naval history, scientists, and Latin American philately, often sought for its crisp bi-color presentation and historically important subject.