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<p>[QUOTE=&quot;coop, post: 2147088, member: 17656&quot;]The design of the 1990 forward coins for Denver and San Francisco the mint marks were part of the design of the coin. (Not punched on the dies after 1989) So it is impossible to be a RPM. The locations of the mint marks are all the same on coins that year. So it might be die deterioration/coin contact/machine damage to this device/or a doubled die. It is not a doubled die, so it may be one of the first two suggestions.[/QUOTE]</p><p><br /></p>

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