Mail posted at sea is generally held by the ship's purser or postal officer, if it has one, until the next port with postal facilities is reached.
Maritimas: (Sp.) letters posted at sea and bearing some sort of maritime marking. Maritime and Newfoundland Airways: 1931 label prepared for a flight to St. Pierre; prohibited by the French government.
Posted at Sea - A maritime handstamp applied to indicate that the letter had been posted on board ship. Povey, Charles - (b. d.1743).
See also: Postal history, Local, Used, Postmark, Strike
 
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