This set from Costa Rica (1924) features finely engraved portraits of important national leaders, printed by the American Bank Note Company. The 25c blue and 50c green depict José María Alfaro (1842), a key political figure; the 3c blue honors General Tomás Guardia (1870), a military leader and president; and the 10c red shows Juan Mora Fernández (1824), Costa Rica’s first head of state. These issues include both regular postage and airmail values, showcasing early 20th-century Costa Rican heritage through classic ABNCo engraving. A desirable set for collectors of Central American history and portrait definitives.