6 Kreuzer black on rose, type IA, large corner of the sheet ( left 9, 5 mm and above 7 mm margin) top right also to the others sides on all sides having full margins cut! In unused condition probably the non-plus-ultra of this stamp! Photo expertize Dr. Helbig BPP on "unused with original gumming" sounding and new photo expertize Sem BPP (2017) : "whose gum not date-appropriate. On face to grip remains probably of the original gum at, otherwise perfect. Already as unused normal stamp rare, as corner of the sheet to the rarities of the collection areas counting. "and without any signs! There are only a few unused corners of the sheet known!