10 C. Postage stamps issue \"Merkur head\" and 90 C. Special edition \"Guillotiere bridge in Lyon\" with hand stamp overprint in type I, properly franked mixed franking on first days letter from Dunkirk 1.07.1940 to Ghyvelde with on the back arrival stamp from 2.07.1940, in perfect condition, expertise Lothar Herbst VP (2019) : \"the preservation is perfect. The stamps are only in very small number of pieces known, therefore are they very rare. \", Michel 700.-