CoinWorld - U.S. Mint officials confirmed Jan. 15 they were aware of the existence of a dollar mule error coin struck at the Denver Mint before Numismatic Guaranty Corp. announced Jan. 14 that the grading service had authenticated and graded the currently only known example.

"We are aware of this error coin from the past," U.S. Mint spokesman Michael White told
Coin World in a Jan. 14 statement. "Since 2014 we have implemented multiple controls and mistake-proofing measures both within the Coining Die Vault and Numismatics operations which will prevent a similar error from occurring again."
The mule error was struck on a manganese-brass-clad dollar planchet with a Sacagawea obverse die for a
Native American dollar paired with the common Statue of Liberty reverse for the
Presidential dollar series, instead of the Hospitality
Native American dollar reverse expected for 2014.
The Hospitality design depicts a Native American man offering a pipe while his wife offers provisions of fish, corn, roots and gourds. In the background is a stylized image of the northwest quadrant of the face of Capt. William Clark's compass, highlighting the area the Lewis and Clark Expedition explored.
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