10 C. Postal stamp \"Merkur head and 90 C. Special stamps issue \"150. Anniversary the French Revolution\" with overprint in type I, properly franked mixed franking on cover from \"Dunkerque 18.07.1940\" to Ghyvelde with reverse arrival postmark from 15.07.1940, faultless condition, expertized Dreyfus, 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 1.000.-