Paquebot

Beginning in 1894, British and French passenger ships began to use the system started by the UPU. In it, if a letter was mailed on the high seas, it was to bear the stamps of the country where the ship was registered. Alternately, if a ship was in port or territorial waters, the stamps of that country could also be used. Letters needed to be handstamped PAQUEBOT or similarly, often used to cancel stamps. There could be additional cachets or markings as well to identify the originating ship. There are a wide variety of markings in existence.

This is not to be confused with seapost, where official government post offices were installed on certain ships.  File:Bahrain paquebot.jpg|cover mailed from Bahrain, ship of Indian registry. File:Brunei paquebot.jpg|cover mailed in Brunei, ship of Hong Kong registry. File:GB paquebot.jpg|cover posted on a ship of British registry. 

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