1 / 2 Shilling black on bright violet, proof 1861, block of four, unused with original gumming, very rare, detailed photo expertize Dr. Mozek BPP (2019) ; "the having bright colors unit is unused with original gum and point at slight deficiencies (left touched and right upper stamp slightly foxed) on. A rare proof from the to indicated from Dr. Werner only approximate 300 pieces have been preserved are. Despite the slight deficiencies a very scarce unit. "