1919, 2 d. orange and 2½ d. blue tied to registered cover by BRITISH A.P.O. CONSTANTINOPLE 14/OC/19 cds. (type Z12) to Ismail Şefkati in Berlin and retour with german return to sender mark ‘Aufruf erfolglos’ on reverse, blue B.A.P.O. registration label, water toned and flaw at bottom, otherwise fine and scarce.