25 C. Merkur head as block of four with vertical (downward readable) overprint \"Occupied area North France\", this as exclusively overprint over all fours values going, properly franking on cover from \"Ghyvelde 4.07.1940\" to Dunkirk with arrival stamp from 05.07.1940, faultless condition, expertized Pickenpack, Zierer and expertise Lothar Herbst VP (2021) : \"the condition is perfect. The stamps are only in small number of pieces known, therefore are they rare. \", Michel 1.500.-