3 Sgr. Black on yellow, block of four from right margin of sheet (23 mm), having bright colors and on all sides having full margins extremely fine copy, unused with original gumming and rest of hinge - the left, vertical pair even in perfect condition mint never hinged without signs, largest known unit of this stamp in unused condition, in present quality and fresh probably the most beautiful known copy. Photo expertize Brettl BPP: "in fine, perfect condition. Rare and attractive. As block of four largest known unit. " and expertise Voigt VP (2019) : "the condition is perfect. As block of four largest known unit. "