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coin doctoring

This 1916 Philadelphia Mint Winged Liberty dime was doctored to add a Denver mint mark. (Photo courtesy of NGC, the PNG’s official authentication and grading service)
World Coin News

PNG Urges “Preserve the Past” and Offers to Assist Victims of Coin Doctoring

By Numismatic News StaffSep 1, 2019
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Reader Viewpoint

Viewpoint: Most coin alterations are ‘doctoring’

By NMNMay 15, 2012