5 C. postal stamp, 75 C. "international Sparkassenkongress" and 20 C. "100. day of death C. J. Rouget de Lisle" with overprint in type I as correctly franked mixed franking on cover from "Dunkerque 2. 7. 40" to Bourbourg with reverse arrival postmark from 3. 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.-