The penny finder posted photos of the Philadelphia-minted Lincoln head penny with the apparent year 1283 on the website cointalk.org.
Peter Davis, the founder of cointalk.org, says the cause was likely a lump of metal bulging abnormally out of the surface of the coin when it was minted.
Davis says theyre commonly called error coins among collectors but this one is noteworthy because the defect happened to be over the date, making it look like it was printed hundreds of years before America and Honest Abe were born.
He says another penny with a defect elsewhere might sell for about one dollar, but this one could go for as much as $100 because of its uniqueness.
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