KNUROW, 20 Pfg blue vertical pair, 25 Pfg dark brown vertical pair, Steelworks and Dove of Peace 1920 on registered letter with advertising imprint (Rundschau für Briefmarkensammler u. -Händler) to Gößnitz, double-circle KNUROW 9 3 21 * (Kr. RYBNIK) a (OS handbook No. 149.2), arrival (10.3.1921) on reverse, propaganda label (Oberschlesier! sei heimattreu...) on reverse, very neat strike, decorative cover