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It's hard to say without seeing the coin, but there are 3 possibilities I can think of:

> The coin came from one of those novelty sets that you see advertised in some magazines. Resellers plate the coins with a thin layer of gold and sell them at a huge markup. These are considered to be altered coins and have no added value to numismatists.

> The gold color is due to exposure to heat or some corrosive chemical. Again, this is a damaged coin worth only 25¢

> The gold color is actually the copper core, exposed when one side of the nickel-copper cladding came off. This is called a lamination error and is a true mistake. Lamination errors can retail for $15 to $20.

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16y ago
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Q: What is the value of a 2007 Idaho quarter that is gold on one side and silver on the other?
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