So-Called Dollars are a category of collectible coins representing medals or tokens that commemorate significant events, people, or places in U.S. history, issued primarily in the 19th and early 20th centuries. The term originated from a series of pieces that resemble the One Dollar denomination but are not official currency. The 1872 So-Called Dollar, often relating to the Centennial Exposition, is notable for its historical context and design, making it a sought-after item among collectors. These pieces are prized for their artistic merit and the stories they tell about American culture and history.