 The Winter Olympic coins produced in the Royal Canadian Mint Olympic coins program for the 2010 Winter Olympics in Vancouver featured several mules which entered circulation.One of the first authentic mule errors to be released by the U.S. Mint (as opposed to the deliberate mules of the mid-1800s) was the 2000 Sacagawea dollar – Washington quarter mule.It features the obverse of a Washington state quarter and the reverse of a Sacagawea dollar.