30 C. "Mercury Head" definitive and 70 C. "Le Puy en Velay" commemorative, type I overprint, correct mixed franking on letter "Ghyvelde 2.07.1940" to Dunkirk, arrival "3.07.1940" 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. 800.-