15 C. Postage stamps issue \"Merkur head\" in the vertical pair with overprint \"Occupied area North France\" in type I, variety inverted overprint in mixed franking with 10 C. Merkur head and 80 C. Charity issue \"marshal Joseph Joffre\" each with overprint \"Occupied area North France\" in type I on First Day Cover with cancellation \"Dunkerque 1.07.1940\" to Arneke with arrival postmark on the back from 02.07.1940, faultless condition, unsigned, expertise Lothar Herbst VP (2023) \"the condition is perfect. The stamps (Michel number 52 and 145) are only in very small number of pieces known, therefore are they very rare. The total edition of the Michel number 6 was only 300 pairs, only a part of it is until today known. Very rare, especially on First Day Cover! \", Michel 2.520.-