50 C. Special issue "500th Anniversary of the Liberation of Orleans" with overprint in Type I, postal franking on a letter from Ghyvelde 21. 07. 1940 to Dunkerque with arrival postmark on the reverse dated 22. 07. 1940, flawless condition, examined by Calves, Dreyfus, Roumet and expertise by Lothar Herbst VP (2025) "The condition is impeccable. The stamps are generally known only in very small quantities, therefore they are very rare. The present vertical pair of stamps with advertising attachment does not come from the sheet, but from the stamp booklet. Stamps from booklets (MH) as a multiple franking are extremely rare.", Michel 3. 000.-