Plovdiv-Filibe: 1851 Registered entire letter from Plovdiv to Constantinople showing fine Arabic negative “An Canib Posta-i Filibe 256” (on behalf of Plovdiv Post Office 1840) handstamp in blue (Coles & Walker fig. 16) with Arabic small negative “Taahhüt olunmuştur” (has been registered) seal alongside, weight 3 Dirhem / postal charge 4 piastres in manuscript at top left side, signed Nakri