10 Pfg dark orange vertical pair and single Plebiscite on 20 March 1921, multiple franking on black-and-white picture postcard from Mylowitz to Berlin, oval railway post KANDRZIN-BAUERWITZ ZUG 953 21.3.1921 (OS handbook no. A.10.3), rare cancellation, additionally cancelled 21.3.1921 outside official validity, age and use wear typical of period