KATTOWITZ, 5 Pfg dark green block of twelve (reverse), 15 Pfg grey-violet, 25 Pfg vertical strip of three with horizontal gutter (front), Steelworks and Dove of Peace 1920 on registered letter to Prag-Smichov / Czechoslovakia, double-circle KATTOWITZ 13 6 20 * (OBERSCHL) o (OS handbook No. 141.36), passed German currency control in Dresden: brown-yellow resealing strip / control label (unlisted in OS handbook) and violet single-circle "46" (OS handbook No. Ca), age and use marks typical of period