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It weights 2.5 grams I don't know anything please help
A 1997 D Lincoln Cent is made on a copper plated zinc planchet.
It is supposed to weigh 2.5 grams.
Bronze cents weigh 3.11 grams.
And…
The plated zinc planchets have loads of issues - the plating is thin and the zinc underneath often gets exposed.
They also suffer from Zinc Rot.
I think your cent shows post mint damage.
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