1 Mark German Reich with "Memelgebiet" overprint on wrong basic stamp (MiNr. A113a instead of MiNr. 94 B II - besides the printing method, the design differs too: Reich Post Office now with flags), mint never hinged and unsigned, error discovered only 80 years after issue, photo certificate Prof Dr. Udo E. Klein BPP "The gum is typical original gum. The condition is faultless.", Mi. 18.000.-