25 C. "Mercury Head" definitive mixed franking with 75 C. "Paul Doumer" definitive, type I overprint, correct franking on letter Ghyvelde 21 7 40 to Dunkirk, arrival 22.07.40 on reverse, perfect condition, expertised Calves, Dreyfus, Roumet, Lothar Herbst VP expert opinion: "Condition faultless. Stamps known in very small numbers and therefore very rare.", Mi. 1.700.-; first time we can offer this franking combination!