20 Kopeck postal stationery card with imprint "Pleskau / 20 kop", with advertising slogan 06, black hand-stamped imprint, addressed, postmarked "PCKOB * K * 18 9 41" and "PCKOB * a * 16 9 41", flawless condition, expertized by Dr. Rommerskirchen BPP, photographic finding by Robert Brunel VP (2025), "The condition is flawless."