Ottoman Turkey: 1883 (14 February). Cover to Egypt pre-franked with 1pi of 1879 sphinx & pyramid definitive additionally franked with 1pi of 1876 Dulos stamp for single weight one piastre UPU member countries foreign letter rate tied by double boxed DERSAADET (A&P type 12) handstamp and Constantinople-Galata * Depart datestamp. Reverse 20 February Caire arrival cds. Egyptian Post Office in Istanbul closed on 30 July 1881. Probably sender tried to post it with Egyptian stamp but refused and Ottoman stamp added.Unique combination. 2008 Isfila certificate.
