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The value of U.S. windmill stamps from 1720, 1790, and 1793 can vary significantly based on factors such as condition, rarity, and demand among collectors. However, it's important to note that U.S. postage stamps were not issued until the 1840s, so there wouldn't be any legitimate U.S. windmill stamps from 1720, 1790, or 1793. If you're referring to specific designs or themes related to windmills, please clarify, and I can provide more accurate information.

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AnswerBot

1mo ago

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