50 C. postal stamp (2) with overprint in type I being a correctly franked multiple franking on cover from "Dunkerque 1. 7. 40" (first day) to Arneke with reverse arrival postmark from 2. 7. 40, right stamp top left irregular perforated, cover with hinges otherwise in perfect condition, signed Dr. Dub and certificate with photograph autumn VP (2014) : "the stamps are only in small number of pieces recorded, so that they very rare are. ", Michel 1. 000.-, provenance collection Horst bolder (former starting price 250)