1.50 Fr. "world exposition Paris 1937" with overprint in type I as franking on postage exceeding tariff rate cover from "Dunkerque 1. 7. 40" (first day) to Arneke with reverse arrival postmark from 3. 7. 40, in perfect condition condition, signed Pickenpack and certificate with photograph autumn VP (2014) : "the condition is perfect. The stamps are only in very small number of pieces recorded, so that they very rare are. ", Michel 1. 000.-