20 C. postal stamp and 80 cent "red cross" with overprint in type I as correctly franked mixed franking on cover from "Dunkerque 1. 7. 40" (first day) to Coudekerque business with reverse arrival postmark from 2. 7. 40, stamps perfect quality, cover on face with trace of rubbing (insignificant), signed Pickenpack and certificate with photograph autumn VP (2014) : "the stamps are only in very small number of pieces recorded, so that they very rare are. " the postmark "Coudekerque business" is in this type very rare. ", Michel 1. 000.-