1 Mark German Reich with a red overprint in Mediävalschrift, everything perfectly mintly, signedly 3.500.-considerably almost underestimates Kosack and certificate Prof. Dr. Klein VPP (2012) "genuine and perfect", Michel, extremely rare stamp which is hardly offered, offered forgeries are on the market! Opportunity of the acquisition of this extremely rare stamp with an impression of only approx. 180 pieces!