Stampless printed 'On His Majesty's Service' official cover re-used with label pasted on reverse with two strikes of FIELD POST OFFICE 731 cds dated 29 MAY 1945 located in HAIFA between January 1945 and May 1948 serving APO S251 with printed blue on white 'FPO D.S. No.731' formular registration label alongside. Addressed to HAIFA with oval REGISTERED HAIFA arrival mark. A nice registered item.