Eisenhower dollars, also known as "Ike" dollars, were minted by the United States from 1971 to 1978. The 1976 Ike dollar features a dual date of 1776-1976, commemorating the American Bicentennial, and is characterized by its large size compared to other U.S. coins. The Philadelphia Mint produced these coins without a mint mark, making them distinguishable among the different mint locations. Collectors often seek out the 1976 version due to its unique design and historical significance.