10 C. Postal stamp \"Merkur head\" and 90 C. Charity issue \"society for Births decline\" with hand stamp overprint in type I, properly franked mixed franking on letter from \"Dunkerque 02.07.40\" to Ghyvelde with on the back arrival stamp from 03.07.1940, faultless preservation, unsigned, expertise Lothar Herbst VP (2018) : \"the preservation is perfect. The stamps are only in very small number of pieces known, therefore are they very rare. \", Michel 1.000.-