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,what is this,no stamps,no other markings such as Prisoner or Flag of Truce mail
It is an incoming steamship letter - letters carried by steamship under contract with the Post Office and carried on ocean routes that the Post Office considered to be post roads. At the time of letter the rate was 10˘ regardless of distance. The letter originated in an unknown foreign country.
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N.O was occupied in 1864,did these get through covertly
By January 1865 the Union controlled the entire Mississippi River and reestablished mail routes. There was nothing covert - the steamship sailed into New Orleans and deposited the mail at the Post Office.