90 C. special stamp "Battle ship" in mixed franking with 10 C. postal stamp with overprint in type I being a correctly franked on cover from "Dunkerque 14. 7. 40" to Ghyvelde with reverse arrival postmark from 15. 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. . "