20 Kopecks on 30 Kopecks postal stamp "workers" with sample overprint "Pleskau" within with new designation of value, nice letter piece used with genuine Cyrillic strike PSKOW -k 14 8 21, the stamp point at left above a corner perforation defect on, issued only 24 examples, rarity of the area, signed Dr. Schultz and photo expertize Walter Zirath BPP (2025) "top left has the stamp a corner perforation defect. the other condition is perfect. it is a proof print the due to the low issue (24 piece) very rare is. ", Michel 4.000.-