1982 large date copper penny value 1982 large date vs small date 1982 large date zinc penny value 1982 large date copper penny 1982 large date penny weight 1982 large date 3.1 grams 1982 large date no mint mark 1982 large date penny 2.5 grams 1982 large and small date penny 1982 large date penny 3.1 grams value