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ISWSC Stamp Answer Person Question — value estimate

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created on:
Jan 10 2020
11:28:46 AM
I received a Chinese stamp collection around 1960, from a missionary who had spent the 30's and 40's in Mainland China, until he was asked to leave in 1949 by the communists. How do I find out if any of these stamps are valuable, from someone honest? Mostly 1940's, some overprints, some Japanese occupation.