History of the Morgan Silver Dollar The Morgan Dollars is one of the most famous and most highly collected U.S. coins of all time. These large Silver coins are known for their value, quality of strike, design and beauty. This series may be the most common of all 19th-century U.S. coins. Morgan Silver Dollars hold immense historical significance, being a major part of America’s early development westward. There are many numerous varieties and overdates, which makes collecting them both complex and interesting. The 1921 Morgan Silver Dollar is highly collectible.