So-Called Dollars are a category of commemorative medals and tokens that resemble dollar coins but are not legal tender. They were often produced to commemorate specific events, anniversaries, or notable figures in American history. The term "So-Called Dollar" originated from the book by Harold M. Gibbs published in the 1930s, which cataloged these items. The 1901 So-Called Dollar, specifically, commemorates the Pan-American Exposition held in Buffalo, New York, and is a popular collectible among numismatists due to its historical significance and artistic design.