PALESTINE 1917, double-circle Deutsche Feldpost 1.10.17 11-12V * * * on postage-free picture postcard addressed to Field Post Office 1015 (= Imperial German Field Post Office of Guards Corps, then located in Bouchain / France), sender's address Field Post 663 and violet unit handstamp KÖNIGL. PREUSS. FLIEGER-ABTEILUNG 303, this unit, established 23.7.1917, belonged to Army Group Jildirim (Yildirim) and operated in Palestine and the Middle East, unusually good condition