30 Kop. Postal stationery cover of the Soviet Union with single line cancel \"Pleskau\" in violet, tied by violet cancel \"PSKOW -a ? 8 41\", after the occupation of Pleskau, all the mail found in the letterboxes received this single line cancel in red or violet before transport to the consignee, from this entire pieces are only a few have been preserved, expertized Dr. Schultz and photo expertize Walter Zirath BPP: \"the cover is in commercially used condition. \"