10 Kopecks registered postal stationery with overprint "Pleskau / 20 kop", violet hand stamp overprint with additional franking 40 Kopecks, Michel number 6, horizontal pair, cancelled by cancel "PCKOB * K * 11 9 41" and cancel "PCKOB * a * 11 9 41", correct franked registered mail, very fine, photo expertize Robert Brunel VP (2025) "the condition is perfect", expertized Zirath BPP