60 Kopecks postal stationery cover with overprint "Pleskau / 60 kop", black hand stamp overprint, addressed, cancelled by "PCKOB * K * -4 3 42" and "PCKOB * a * -4 3 42" and registered cancel, all genuine, very fine, photo expertize Robert Brunel VP (2025) "the condition is perfect", expertized E. Franck