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. \"

50 K. With printing on the Paper back with inverted overprint, unused, without gum, as issued, issued only 25 pieces, photo expertize Mikulski, Michel 3.500.-