So-Called Dollars refer to a type of commemorative medal or coin issued in the United States, typically celebrating a specific event, person, or milestone. The term originated from pieces that were often produced for special occasions but not authorized as official currency. The 1939 So-Called Dollars were created primarily for the New York World's Fair and feature designs that commemorate the event. Collectors seek these items for their historical significance and unique artistic designs, and they hold value based on rarity, condition, and demand within the numismatic community.