BIRKENTAL, 10 Pfg orange-red horizontal pair, 30 Pfg orange horizontal pair (reverse), 5 Pfg green, 20 Pfg blue, 75 Pfg dark green, Steelworks and Dove of Peace 1920 on express letter to Vienna, double-circle BIRKENTAL 19 5 20 (Kr. KATTOWITZ) (OS handbook No. 019.1), passed German currency control in Dresden, double-circle DRESDEN 21.5.20 ALTST. 7 l (OS handbook No. III Bb 2) and violet single-circle "79" (unlisted in OS handbook), age and use marks typical of period