30 cent postage stamps issue "Merkur head" (2) and 40 cent special stamps issue "world exhibition 1937 in Paris", correctly franked mixed franking on cover from Ghyvelde 21.07.1940 to Dunkerque with on the back arrival stamp from 22.07.1940, faultless condition, expertise autumn VP: "the condition is perfect. The stamps are only in very small number of pieces known, therefore are they very rare. ", Michel 1.000.-