Too, I'm thinking environmental toning. Over many decades of roll searching, I've seen similar nickels (different years and mints)--perhaps 50 total. They are cool.
If the coin is less that 5 grams, then it is a normal nickel that the color was altered in circulation. If it were struck on a cent planchet, it would weigh 3.11 grams. The thickness shows me that is not a cent planchet. Also the width is larger than a normal cent. So your coin is normal. Also the color would be red.
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