80 Pfg Steelworks and Dove 1920, 10 Pfg dark red-orange with vertical gutter at right, Plebiscite on 20 March 1921, on registered letter to Groß-Peterwitz/Upper Silesia, double-circle RATIBOR 20.3.1921 (OS handbook no. 274.3), arrival (OS handbook no. 109.1, 21.3.1921) on reverse, very neat strikes, light abrasion on lower half of envelope, stamps intact