50 K. Black on dark gray blue, cut, horizontal pair with both stamps in type I from corner margin top left (position 1+2) with overprint \"proof\", unused without gum - as produced, edition of the stamp amounts in type I only 15 examples, therefore places this horizontal pair a major rarity of the collection areas dar, expertized Mikulski and photo expertize Walter Zirath BPP (2022) : \"the condition is perfect. \"