30 Kopek postage stamp "Workers" with trial imprint "Pleskau" in frame without new denomination, marginal piece, mint never hinged, flawless condition, edition of only 50 pieces, signed by Dr. Rommerskirchen BPP and photo certificate Walter Zirath BPP (2015) " The condition is impeccable and the perforation is typical for this issue. This is a rare trial imprint.", Michel 2. 500.-