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5. 1804 Bowed Liberty Bone, Worth Over $ 3 Million
A coin so rare, only 15 are known to live. Despite the time “1804” stamped on it, these bones were actually formed in the 1830s. With a history full of riddles and counterfeiting attempts, these coins remain one of the holy grails for collectors. One vended for a jaw-dropping $4.14 million in 1999!