This cover was mailed on Guam in 1918, a very rare mail origin.
Note the return address: U.S.S. Barracks. That ship was the station ship for the military at Guam.
Note also that the cover is marked, in a different ink, as ‘Via Cable Ship Pacific’.
The back of the cover is quite a surprise, since it has censor tape (not visible from the front), and a handstamp marking of the United States postal facility in Shanghai, China.
It appears that this letter, along with the rest of the mail, was transported from Guam, and handed over from the ship in Shanghai a month later. From there, it made its way to the destination.
Note that the rate is the same 3 cents as for a domestic U. S. letter.
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