20 Kopecks registered postal stationery with overprint "Pleskau / 20 kop", with advertising slogan 06, black hand stamp overprint, with additional franking, Pleskau Michel number 8, cancelled "PCKOB * K * 9 10 41" and "PCKOB * a * 10 10 42", very fine, registered mail is overfranked, photo expertize Robert Brunel VP (2025), "the condition is perfect