So-Called Dollars are a type of exonumic coin, which are not intended for general circulation but serve as commemorative items, often created to honor specific events, individuals, or organizations. The term "So-Called Dollar" primarily refers to pieces that mimic the appearance and size of U.S. silver dollars. The 1939 So-Called Dollars are particularly significant as they commemorate the 1939 New York World's Fair, featuring various designs that reflect themes of progress and modernity. Collectors value these pieces not only for their historical context but also for their artistic designs and the narratives they convey about American culture during that time.