30 C. and 70 C. "Mercury Head" definitives, horizontal handstamped "Occupied Territory Northern France" type I across both stamps, correct mixed franking on letter "Dunkerque 8.07.40" to Ghyvelde, arrival 9.7.40 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.-