So-Called Dollars are a genre of collectible coins that are not official U.S. currency but are often made to commemorate events or individuals. They typically feature a dollar-sized design and emerged in the late 19th century, with the first notable examples appearing around 1892. The 1916 So-Called Dollar, specifically, refers to a series created to mark the Panama-Pacific International Exposition, showcasing intricate designs that reflect the themes of achievement and celebration in American history. These coins are popular among collectors for their artistic value and historical significance.