25 C. postal stamp Merkur and 75 C. postal stamp Paul Doumer being a correctly franked to 1 Fr. with overprint in type I on cover from "Ghyvelde 21. 7. 40" to Dunkerque north with reverse arrival postmark from 22. 7. 40, signed Dreyfuss, Roumet and photo expertize Lothar autumn VP (2015) : "the condition is perfect. The stamps are only in very small number of pieces recorded, so that they very rare are. "