10 C. Merkur head and 90 C. Special edition \"street over the Col d I`Iseran\" with overprint in type I, properly franking on letter front, cancelled \"Dunkerque 02.07.1940\", faultless condition, expertized Dreyfuss, Roumet 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 600.-