The Presidential Dollar coins were issued by the United States Mint from 2007 to 2016, featuring the portraits of U.S. presidents in the order they served. Each coin has a face value of one dollar and is made primarily of copper and manganese. The series began with George Washington and continued with subsequent presidents, releasing several coins each year. The coins are notable for their edge inscriptions, which include the year of minting and the motto "E Pluribus Unum." Collectors often seek these coins for their historical significance and the complete series can be an interesting addition to any numismatic collection.