25 C. and 75. C. postal stamp with overprint in type I as correctly franked on cover from "Dunkerque 2. 7. 40" to Anerke with reverse arrival postmark from 3. 7. 40, signed Dr. Dub 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. ", Michel 1. 000.-