30 C. And 70 C. Postal stamps \"Merkur head\", with horizontal, over both stamps passing over hand stamp overprint \"Occupied area North France\" in type I, as properly franked mixed franking on cover from \"Dunkerque 26.07.40\" to Ghyvelde with arrival postmark on the back from 27.7.40, faultless condition, 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 800.-