10 C. \"Merkur head\" and 90 C. Special edition \"150. Anniversary the French Revolution\" with overprint in type I, properly franking on cover from \"Dunkerque 8.07.1940\" to Ghyvelde with on the back arrival cancel from 9.07.1940, faultless condition, expertized Behr and expertise Lothar Herbst VP (2023) : \"the condition is perfect. The stamps are only in very small number of pieces known, therefore are they very rare. \", Michel 1.000.-