45 C. Merkur head and 55 C. Special edition \"centenary from Leon Gambetta\" with overprint in type I, properly franking on cover from \"Ghyvelde 21.07.1940\" to Dunkerque with arrival cancel from 22.07.1940, faultless condition, expertized Dreyfuss, Roumet, Tust BPP 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 1.300.-