10 C. definitive issue "Mercury Head" and 90 Cent charity issue "Children of the Unemployed" with hand-stamped surcharge in Type I, appropriate mixed franking on a first day cover from "Dunkerque 01. 07. 40" to Ghyvelde with a reverse arrival stamp dated 02. 07. 1940, flawless condition, certified by Calves, Dreyfus, Roumet and expertise by Lothar Herbst VP (2025) "The condition is impeccable. The stamps are known in very small quantities, therefore they are very rare.", Michel 1. 000.-