Here is a German map from the "Adolf Stieler's Hand Atlas (7th Edition)" which was printed and hand-coloured in Gotha in 1880 by Justus Perthes. The title of the map is "CHINA (OSTL.THEIL), KOREA UND JAPAN". In this map, "Matsu Sima (Dagelet I.)" and "Liancourt In. (d. Franzosen) / Hornet In. (d. Englander) " can be seen in the Japanisches Meer (Japanese Sea) with the National Border which indicates both of the islands above were Japanese territory.