Bau PRINCIPAL DÉB/ ARM. DU NORD in black on letter from Paris (P in triangle) to L'ecluse (Sluis), addressee moved to Breskens and the letter was forwarded with debourse stamp, only known letter with this stamp (not in PEP, see NVPH Specialiteitencatalogus 2e editie p. 220 under H), ex. coll. Thiaude, very fine