45 C. "Mercury Head" definitive and 55 C. "Medical Service Monument" charity stamp, handstamp type I, correct mixed franking on letter "Dunkerque 11.07.40" to Ghyvelde, arrival 12.07.1940 on reverse, perfect condition, expertised Calves, Dreyfus, Roumet, Lothar Herbst VP expert opinion (2025): "Condition faultless. Stamps known in very small numbers and therefore very rare.", Mi. 1.100.-