15 C. postal stamp (2) and 70 C. "Births decline" with overprint in type I as correctly franked mixed franking on cover from "Dunkerque 1. 7. 40" (first day) to Bourbourg with reverse arrival postmark from 2. 7. 40, in perfect condition condition, signed Zierer and certificate with photograph autumn VP (2014) : "the condition is perfect. The stamps are only in very small number of pieces recorded, so that they very rare are. The postmark "Bourbourg" is very rare. ", Michel 1. 000.-