1982 was the year they switched to zinc. Yours are the bronze (copper) variety.
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I have two 1982 lincoln cents, one that weighs 3.07 grams and the other weighs 3.09 grams neither one has a mint mark. I have more photos if needed.
M
Marc's Expert Appraisal
ANA-Certified Numismatist · Hudson Valley Numismatics
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