30 Kopecks postal stamp "workers" with sample overprint "Pleskau" within without new designation of value, side margin piece, mint never hinged, very fine, issued only 50 pieces, signed Dr. Rommerskirchen BPP and photo expertize Walter Zirath BPP (2015) " the condition is perfect and the perforation is for this issue typically. this is a rarely proof print. ", Michel 2.500.-