50 C. \"Merkur head\" with overprint \"Occupied area North France in type I\", vertical pair as properly franking on cover from \"Gravelines 20.07.1940\" to Malo les Bains with arrival postmark on the back from 21.07.1940, faultless condition, issued only 3.000 pairs, expertise Lothar Herbst VP (2023) \"the condition is perfect. The cancel Graelines (small town at the North Sea coast) is rare. \", Michel 600.-