U.S. Postal Agency, Shanghai, China, Oct. 9, 1918. Clear strike of duplex cancel on cover with "Knights of Columbus War Activities" part-printed return address to Los Angeles Cal. and forwarded to Arroyo Grandes Cal., purple "A.E.F. Siberia/Censored" boxed handstamp, signed by censor, some edge flaws, still Very Fine, very scarce use, the first American troops of the A.E.F. arrived in Siberia in Sep. 1918 and authorization for establishment of a postal agency followed soon after, no special datestamp was immediately available and so this U.S. Postal Agency in Shanghai marking was used on a provisional basis until the correct handstamp could be supplied, this temporary use was only operational for three weeks, until Oct. 17

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