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Currently, Japanese World War II collectibles are less valuable than German or American ones.
Assuming these handkerchiefs are indeed authentic, and assuming that you could prove that to a potential buyer, and assuming they are in excellent condition, the current retail (replacement or insurance) value of these items is $100 each. If you were to sell them, you could expect to get the fair market (private sale or auction) value of approximately 40% of the retail amount or $40 each, depending on location and actual condition.
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There are many examples of hand painted fabric items made by Japanese POWs.
I'm sorry - I don't read Japanese. But, you might want to contact The Asia Society on Park Avenue in New York. They may be able to help you, or connect you with someone who can. http://asiasociety.org
Currently, among World War II collectibles, Japanese material is at the bottom of the desirability list.
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