5 DM Pieck with right lower corner of the sheet and printers mark on Locate-FDC from" (10) LEIPZIG O 40 3.1.51", in perfect condition, one of the rarest First Day Cover of the German Demokratic Republik philately, with printers mark so far less than a handful known, top piece for the large collection, photo expertize Paul BPP "the stamp is genuine and immaculate. The stamp impression is genuine and date-appropriate. The cover is in very good total maintenance. There is First-Day-Cover (First Day Cover) before. ", Michel 2.600.- printers mark