2008 Oklahoma Quarter with the "Extra Leaf" error: This quarter features an extra leaf on the ear of corn on the reverse side.
2004 Wisconsin Quarter with the "Extra Leaf" error: Similar to the Oklahoma quarter, some Wisconsin quarters were minted with an extra leaf.
2005 Minnesota Quarter with the "Extra Tree" error: A small number of Minnesota quarters were minted with an extra tree in the design.
1999 Delaware Quarter with the "Spitting Horse" error: Some Delaware quarters were minted with a die error that makes it appear as though the horse on the reverse side.
2004-D Wisconsin Quarter with the "High-Low Leaf" error: A variation of the Wisconsin quarter features a leaf that appears to be higher or lower than usual.
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1999-P Connecticut Quarter with the "Spitting Eagle" error: Similar to the Delaware quarter error, some Connecticut quarter.
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2004-D Wisconsin Quarter with an "Inverted Mint Mark" error: A small number of Wisconsin quarters were minted with the "D" mint mark inverted.
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2005 Kansas "In God We Rust" error: Some Kansas quarters were minted with a die error that caused the motto "In God We Trust" to appear as "In God We Rust".
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2007 Wyoming Quarter with the "Double Die Reverse" error: A few Wyoming quarters were minted with a double die error on the reverse side.
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2005-P Minnesota "Extra Tree" error: Similar to the 2005 Minnesota quarter mentioned earlier, some were minted with an extra tree in the design.