50 cent postal stamp blue, vertical pair with overprint in type I, correctly franked 1 Fr. Franking on cover from "St. Pole. Sur Mer 22.7.40" to Dunkerque with reverse arrival postmark 23.7.40, faultless condition, issued only approximate 3.000 pairs, photo expertize Lothar Herbst VP (2016) : "the condition is perfect. ", Michel 600.-