KATTOWITZ, 20 Pfg blue vertical pair, 2 Mark dark brown Steelworks and Dove of Peace 1920 on black-and-white picture postcard to Reval (= Tallinn) / Estonia, double-circle KATTOWITZ 17 6 22 * (OBERSCHL) g (OS handbook No. 141.27), written in Russian, Tallinn roller arrival cancel, rare unusual destination, age and use marks typical of period