Coin Collecting Guides

Free, expert-researched guides to help you find, identify, and value coins — starting with the change in your pocket.

The 12 Most Valuable Pennies (Still in Circulation)

From the million-dollar 1943 copper cent to doubled dies you can still find in rolls — what to look for and what they're worth.

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How Coin Grading Works: The Sheldon Scale Explained

Why two identical coins sell for wildly different prices, what MS-65 means, and when professional grading is worth the fee.

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Mint Marks Explained: The Tiny Letter Worth Thousands

Where to find the mint mark on every U.S. coin, what S, D, CC and W mean, and which ones multiply a coin's value.

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Valuable coins to watch for in circulation, auction records, and collecting tips — one short email a week.

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