INTER-ALLIED COMMISSION - WATERWAYS AND HYDRAULIC ENGINEERING CONTROLLER, 10 Pfg dark orange-red Steelworks and Dove of Peace 1920 on blank coloured postcard, double-circle OPPELN ... 4 20 * (OBERSCHL) k (OS handbook no. 237.24), violet single-circle official seal COMMISSIONE INTERALLEATA DEL GOVERNO E DEL PLEBISCITO ALTA SILESIA - IL CONTROLLORE DELLE VIE FLUVIALI E DELLE OPERE IDRAULICHE (OS handbook no. II.6.d.), very neat strikes, good condition