1955 Lincoln Wheat Cent with a clipped planchet.
All of the above are true double die mint errors, and not to be confused the "Poor Man's" double dies which are not true double dies, but machine doubling, abraded dies or from worn dies. It's also not a double struck coin either. A true double die happens after the engraving lathe accidentally carves a double image on the master hub that is transferred to the die. If the second image appear flat or shelf-like then it's not a double die.
U.S. Mint Error & Varieties
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1943 Lincoln Wheat steel cent struck in collar error.
1967 Lincoln Memorial cent with multiple strikes.
1984 Lincoln Memorial double ear error.
1937-D Buffalo Nickel 3 legs.
2000 Sacagawea Dollar wounded eagle.
1867 Indian Cent 1867/67 over date.
"Cheerios" Sacagawea Dollar Found Without Enhanced Tail Feathers Design
Jaime Hernandez - May 27, 2008
Regular Reverse of 2000 Sacagawea Dollar As part of an effort in 1999 to promote the new Sacagawea dollars, General Mills scattered 5,500 specially packaged, 2000-dated Sacagawea dollars among 10 million boxes of Cheerios cereal. Five years later, it was discovered that the so-called "Cheerios" dollars were actually from a different reverse die type. Some experts consider these pattern coins; others have called them "Reverse of 1999." Read story
The Latest Issue Of Die Variety News Magazine Is Now Available
Posted April 30, 2008
NGC Confirms Major Hub Variety of 2008-W Silver Eagles
Posted April 20,2008
Information and pictures courtesy and as posted on NGC.com
Rare Error Coin Sat On Porch In A Mason Jar For 50 Years
Posted on 6/19/08
Leonard Raymond and Stan Lacks of Plymouth Mass., found an interesting difference of the scissortailed flycatcher on the reverse of the 2008 Oklahoma State Quarter. It appears to be an 'auxiliary wing' under the normal right wing of the bird. Coin World reports it as a sizable die break. CoinWorld.com
By Eric Von Klinger, Coin World Staff
'Auxiliary Wing' 2008 State Quarter