0, 50 Din postal stamp red orange, with inverted overprint \"Serbia\", stamp from position 71 with additional variety \"crown left broken\". The originals gum point at the for so-called \"window stamps\" (in parts of sheets before the overprint inserted single values) traces on, otherwise in perfect condition. There are only 4 examples with inverted overprint known - with plate flaw is an unique! Utmost rarity of the German occupation issues in the II. World war. Photo expertize Dr. Zydek BPP and photo expertize Robert Brunel VP (2018) : \"the other condition is perfect. \"