1 Groschen large shield, gray ultramarine, small size L15, special feature \"vertical most intensive about 4 mm left with defective or badly placed perforation by which design of the stamp so that the right numeral of value complete in the leftmost position to see is\", tied by single circle \"Wroclaw 9 8 74\", small tear, otherwise faultless condition, rare, photo expertize Krug BPP, such strength perforation varieties are rare, because the Empire printing office they actual sorted out, here with special format feature \"L15\" surely by far rare.