30 Kopecks postal stamp, reverse on cover with red one-line overprint "PLESKAU", cancelled "PSKOW -a -8 8 41", properly franking, the red single line cancel became after the occupation on all postal service pieces the in mailboxes found were to authority order mounted, there are only a few examples and therefore are they very rare, expertized Dr. Schultz, Keiler BPP, Krueger, Dr. Rommerskirchen BPP and photo expertize Walter Zirath BPP "defects are indistinguishable", Michel 4.000.-