10 Pfg red-orange, 60 Pfg Prussian blue Steelworks and Dove of Peace 1920, 20 Pfg blue Plebiscite on 20 March 1921, on registered letter to Wilhelmsburg a. d. Elbe, double-circle KRAPPITZ 21.3.21 * (Kr. OPPELN) a, arrival (23.3.1921) on reverse, unusual use of Plebiscite issue outside regular validity, minimal foxing