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Educational Series: What is an RPM ? How to tell if a coin is a Re-punched Mint mark (RPM) Prior to 1990, the US mint used to take the working dies that made coins and added a mintmark to those working dies. If the coins were minted in Denver, they would add a “D”. If the coin was struck in SanFrancisco the US Mint would add a “S” to the working dies. The Re-punched mint mark (RPM) has been deemed as a “variety”, since the US mint employee added an in

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