KATTOWITZ, 15 Pfg dark grey-violet, 25 Pfg dark brown block of three with bottom margin, Steelworks and Dove of Peace 1920 on registered letter to Stuttgart, double-circle KATTOWITZ 9 8 20 * (OBERSCHL) q (OS handbook No. 141.38), additional red boxed handstamp ("... Schutz") not precisely identifiable, and 5 Pfg charity label of "Offiziellen Kriegsfürsorge" on reverse, probably surviving from World War 1, rear envelope flap missing