Sweden. Facit 52, 54 on cover, 2×5+10 öre on cover sent from UPSALA LBR in 1911 to Carl Skottsberg in Helgoland. Skottsberg participated in the Swedish Antarctic Expedition 1901–1903 on the ship Antarctic. Later he led the Swedish Magellanic Expedition in Patagonia 1907–1909. Also two covers sent to Skottsberg in Romania and Java 1929–1931, respectively. Sought-after. (3).