25 piastre on 5 Mark Reichspost, green black / brownish carmine, base stamp type II, overprint in type II, additional overprint "Specimen", corner margin piece top left (rest of hinges in the margin of sheet), stamp mint never hinged, faultless condition, expertized Grobe (double signature) and photo expertize Michael Jaeschke Lantelme BPP "in faultless, mint never hinged condition. ", Michel 900.-