30 Kopecks postal stationery cover with red one-line overprint "PLESKAU", cancelled "PSKOW -a -9 8 41", properly franked use, the red single line cancel became after the occupation on all postal service pieces the in mailboxes found were to authority order mounted, cover centered and vertical each extending kink, there are only a few pieces and therefore are they very rare, expertized HB Zierer, photo expertize Walter Zirath BPP, Michel 4.000.-