30 C. and 70 C. postal stamp with overprint in type I as correctly franked mixed franking on cover from "Ghyvelde 18. 7. 40" to Dunkerque with reverse arrival stamp from 19. 7. 40, faultless, photo expertize autumn VP (2017) : "above of the stamps is the cover minimal from affix of the stamps gum spots. Normal thus no lack. The condition is therefore perfect. The stamps are only in very small number of pieces recorded, so they are very rare. ", Michel 1. 000.- (Fr. 381, 388I)