30 C. Special stamp \"world exhibition 1937\" and 70 C. Postal stamp \"Merkur head\", with horizontal, over both stamps passing over hand stamp overprint in type I, as properly franked mixed franking on cover from \"Ghyvelde north 21-7-40\", to Dunkerque with arrival postmark on the back from 22.7.40, faultless condition, signed Tust BPP and expertise Lothar Herbst VP (2018) : \"the condition is perfect. \"