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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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