50 K. Postal stamp black on dark blue gray, vertical, unperforated type pair of the typen I and II (field 17 and 22) with overprint \"proof\", unused without gum - as produced, faultless condition. Extreme scarce stamps from reference sheet springing - edition of the type I only 15 pieces, of the type II only 7 pieces. Rarity of the German occupation issues in the II. World war. Photo expertize Gerhard Krischke and photo expertize Walter Zirath BPP (8 / 2018) : \"the condition is perfect. \", Michel - .