25-50 and 75 Pfg plebiscite emblem on express registered letter from MARIENWERDER 17.5.20 to Leipzig, 25 Pfg pin-perforated, 50 Pfg perforated better thick-paper variety, arrival LEIZIG 19.5.20 on reverse, usual perforations, envelope opened on two sides, signed Hochstädter BPP