1 Fr+50 C. Charity stamp \"marshal F. Foch\", with vertical inverted hand stamp overprint in type I, as properly franked single franking on cover from \"Ghyvelde north 5-7 40\" to Dunkerque with arrival postmark on the back from 6.7.40, faultless condition. Photo expertize Krischke and expertise Lothar Herbst VP (2018) : \"the condition is perfect. Very rare, especially stamps with inverted overprint. \"