50 C. "500th anniversary of Liberation of Orleans" commemorative, type I overprint, correct multiple franking on letter Ghyvelde 21.07.1940 to Dunkerque, arrival 22.07.1940 on reverse, perfect condition, expertised Calves, Dreyfus, Roumet, Lothar Herbst VP expert opinion (2025): "Condition faultless. Stamps generally known in very small numbers and therefore very rare. This vertical pair with advertising tab comes from a booklet, not a sheet. Booklet stamps as multiple franking extremely rare.", Mi. 3.000.-