25 C. \"Merkur head\" (2) and 50 C. Charity issue \"Musica\" with overprint in type I, properly franking on First Day Cover from \"Dunkirk 1.07.1940\" to Arneke with arrival cancel from 3.07.1940, faultless condition, expertise Lothar Herbst VP (2023) : \"the condition is perfect. The stamps are only in very small number of pieces known, therefore are they very rare. \", Michel 1.440.-