KATTOWITZ, 10 Pfg orange-red, 25 Pfg dark brown block of four and two singles, Steelworks and Dove of Peace 1920 on registered letter to Gleiwitz / OS, double-circle KATTOWITZ 27 12 21 * (OBERSCHL) r (OS handbook No. 141.39), arrival (27.12.1921) on reverse, very neat strikes, age and use marks typical of period