20 Kopecks postal stationery with overprint "Pleskau / 20 kop", with advertising slogan 06, black hand stamp overprint, addressed, cancelled "PCKOB * K * 18 9 41" and "PCKOB * a * 16 9 41", very fine, expertized Dr. Rommerskirchen BPP, photo expertize Robert Brunel VP (2025), "the condition is perfect