Ottoman Turkey: 1918 (4 May). Censored cover used in Istanbul franked with 50pa of 1917 pictorial and tied by Istanbul 39 (A&P type 23) datestamp alongside boxed slogan cachet Istikrazi Dahili, Milli Is, Milli Hizmet(National Loan, National Business, National Service). Very scarce early slogan mark. Part cover flap missing.
