40 C. \"Merkur head\", with overprint in type I, vertical pair from corner margin lower right with date of printing \"29.8.39\", mint never hinged, the stamps in perfect condition, the margin point at typical knick marks on, due to the edition from only 300 pairs are only about 6 corners of the sheet with date of printing possible, at present only two examples known, unsigned, expertise Lothar Herbst VP (2022), Michel 9.000.- - one of the large rarities of the collection areas!