It is one of the first known authentic mule coins to be released into circulation by the United States Mint.

[3] However, no authentic (accidental) mules of United States currency were known to exist.

This changed in the 1990s, when a Lincoln cent (dated 1993-D) with the reverse of a Roosevelt dime were discovered.

[note 1][5] In 2000, Frank Wallis of Arkansas discovered a Sacagawea dollar with the obverse of a Washington quarter.

[6] As of September 2019, 19 examples have been confirmed, 16 of which are owned by a coin collector named Tommy Bolack.