Sorry, I do not speak French, but I sort of understand what you ask.
#851102077: "O.H.M.S" = On Her/His Majesty's Service. Category: Europe > Great Britain > Officials
#553414418 & #441515231: Category: America > United Nations > New York
#496709186: "FPO" = Field Post Office no. 645 of the Indian Forces, "HMS Caprice" = Her/His Majesty's Ship "Caprice". Category: Europe > Great Britain (former colonies & protectorates) < 1936-47 King George VI, or Category: Topics > Militaria