This 2001 P dime looks like it's been copper plated both sides. It weighs 2.216 G, so if it was plated, it didn't really add any weight. There also appears to be Machine Doubling on the left side of the olive branch and and extra raised glob of metal between the D and I in DIME.
Thank you for your feedback. I had a hunch the discoloration was environmental. The coppery color, though, made me think someone might have electroplated it.
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