1 franc postal stamp "Merkur head" with vertical incomplete overprint of the type II on single stamp, variety "inverted overprint - top down" mint never hinged, only approximate five unused / mint never hinged examples known - as variety "inverted overprint" however only this piece - unique, expertized Tust BPP, Roumet and expertise Lothar Herbst VP (2025) "the stamp point at reverse manufactured small black affixed spots from colour on. The other condition is perfect. ", Michel 6.000.-