One of only three known examples, the debate over whether it was intentional or a mistake adds mystique to this pure gold penny. The finest specimen fetched $141,000 at auction in 2013.
This modern rarity combines the familiar Lincoln cent obverse with a Roosevelt dime reverse, a product of stringent US Mint quality.
A single surviving instance where a 1905 Indian cent die struck a gold planchet, highlighting its extreme rarity and purity. Its pristine condition saw it sell for $123,375 in 2015.
With only four confirmed specimens, this error coin from 2001 combines a Lincoln cent obverse with a Roosevelt dime reverse, underscoring its modern rarity.
Uniquely crafted from three dime planchets, forming a clover leaf shape stamped with Eisenhower dollar dies, this oddity of numismatic history dates to around 1971 or 1972 and sold for $105,000 in 2021.
An intriguing instance where a 1970-S Washington quarter was mistakenly struck on a planchet intended for an 1898 $5 gold coin.
This exceptional coin melds a Sacagawea dollar planchet with the profile of George Washington, an error so rare that only eleven genuine examples are known to exist.
A notable example of an off-center strike, where Lady Liberty and the eagle on the reverse are dramatically skewed, creating a visually striking and highly sought-after gold coin.
An extraordinary anomaly where the design of a buffalo nickel was struck on a planchet intended for a $5 gold coin, showcasing an unexpected marriage of two iconic US coin designs.
Remarkable for its 40% off-center strike, this Morgan dollar exhibits a large blank planchet area, emphasizing the extent of the minting error and making it a unique find in numismatic circles.