I have a 1981 D mark dime that appears to be copper. I was needing to know if this is a error coin or just because of age, toning, environment? Please help with this. Also are the letters under the neck normal?
Environmental tarnishing/toning/staining. May have been buried in soil at some point of it's life. Your coin photography is good, but it is a bit blurry and needs to be focused a little more, please.
Yes @jes2, the color is due to environmental toning, such as from being buried. One quick way to confirm is to check the weight. Off-metal or missing-clad strikes won't have the correct mass.
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