A mule coin is a coin struck with dies that were not intended to be paired.
A numismatic mule is a fascinating creature, a hybrid of two designs never meant to appear together. Some are accidental in nature, true errors that any collector would welcome in his or her collection. Other mules were deliberately produced, either accidentally, out of necessity to meet coinage demands, or from a desire to produce something special (even if fraudulent) for collectors.
There is a market for mules just like there is for correctly struck coins.
Among U.S. coins, some mules have achieved legendary status. The most prominent of these would likely be the 14 Sacagawea dollar planchets struck by a Washington quarter dollar obverse die and a Sacagawea dollar reverse die (pictured below.)
Collector Tommy Bolack got his 10th Sacagawea dollar/statehood quarter mule during an Aug. 6th Stack’s Bowers Galleries auction for a total price of $117,500.
Probably the best-known example among foreign coins is the 2000 Canada Millennium series “Map Mule” 25-cent coin. “The obverse is the one normally used for this series and features the bust of Queen Elizabeth. The reverse face of each coin carries a design normally seen on the Royal Canadian Mint medal that accompanies the 12-coin 25-cent piece Mint set produced in that year. The design features a map of Canada constructed from maple leaves. (pictured below)
The Map Mule coins can be found online being sold at prices around $400. For example, a Mint State 63 example sold for $436.99 on eBay in June 2014.
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