Double Die
1984 Double Ear Lincoln Cent
2005 "Extra Tree" Minnesota State Quarter
1955 Double Die
1972 Double Die
1917 Double Die
Related Links - U.S. Mint Errors - Non-Mint Error Coins
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Images courtesy of HA.com
On a proof press, a coin was first struck in the usual way, but instead of completely ejecting from the dies, it flipped over and partially out. A second planchet entered the dies, and the striking of the second planchet bonded it and the first planchet together.
The example, pictured above, sold for $3,737.50 at Heritage Coin Auctions on March 25, 2010.
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