30 Kopecks postal stationery cover with dark pink red hand stamp overprint \"PLESKAU\", tied by gray ultramarine cancel \"NCKOB * a * -9 8 41\", vertical folded and some creased, very rare and only in few copies known, expertized Dr. Schultz and expertise Robert Brunel VP (2023), Michel - . - hardly offered rarity the issues German occupation II. World war!