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The gold color could be due to exposure to chemicals - there's a sodium compound used in high school chem experiments that reacts with copper to form a goldish tint.

Alternately it could be one of the early plated zinc cents struck during the latter half of 1982; sometimes the plating became contaminated with zinc and was lighter in color.

As far as the lack of a mint mark goes, did you look at the other pennies in your change? Philadelphia cents have NEVER had a mint mark, even though other denominations started carrying a P in 1979/80. The reason is that the San Francisco and West Point Mints are sometimes called on to strike extra cents when demand is high. None of the 3 mints put a mark on pennies so the 2 branch mints don't create instant rarities with a W or S.

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Q: Why is a 1982 penny a golden color and without a mintmark?
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