RATIBOR, 15 Pfg dark grey-violet, 60 Pfg Prussian blue Steelworks and Dove 1920, 15 Pfg dark grey-violet Plebiscite of 20 March 1921 with horizontal gutter at bottom on registered cover to Groß-Peterwitz / Upper Silesia, double-circle RATIBOR 20.3.1921 (OS handbook No. 274.3), arrival mark (OS handbook No. 109.1, 21.3.1921) on reverse, very neat postmark strikes, age and usage wear typical of the period.