Germany-GDR 58-67

Germany-GDR 58-67, MNH, $88.75. Michel 261-270. Academy of Science, Berlin, 250th Ann. 1950. Leonhard Euler, Alexander von Humboldt, Theodor Mommsen, Wilhelm von Humboldt, H.L.F. von Helmholtz, Max Planck, Jacob Grimm, W.H. Nernst, Gottfried von Leibnitz, Adolf von Harnack. Please see perforation on 20 pf stamp.