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 First Day Cover from "Dunkerque 1.07.1940" to Ghyvelde with arrival postmark on the back from 2.07.1940, very fine, expertized Calves, Dreyfus, Roumet and expertise Lothar Herbst VP (2025) "the condition is perfect. The stamps are only in very small number of pieces known, therefore are they very rare. ", Michel 1.000.-