25 C. Postal stamp "Merkur head" with overprint in type I, horizontal strip of four - left pair without overprint, right pair with overprint, correctly franked more franking on cover from "Ghyvelde 2.08.1940" to Dunkerque with reverse arrival postmark from "3.08.1940", faultless condition - few tips of the teeth tiniest gum spots (insignificant), expertise Lothar Herbst VP (2018) : "the other condition is perfect. The stamps are only in very small number of pieces known, therefore are they rare. In this variety "pair with overprint" and "pair without overprint" is the franking very rare. ", Michel 1.000.-