KATTOWITZ, 10 Pfg dark red-orange Numeral issue, 5 Mark red-orange Steelworks and Dove of Peace 1920 as mixed franking on insured letter (declared value 3500 Mark) to Berlin-Charlottenburg, single-circle KATTOWITZ (OBERSCHLESIEN) 2 7 20 (OS handbook No. 141.1), rare cancel, arrival (4.7.1920) on reverse, age and use marks typical of period