So-Called Dollars are a type of commemorative medal or coin that were produced to mark significant events or anniversaries. The term is most commonly associated with pieces that resemble U.S. dollar coins but were not issued by the U.S. Mint. The 1903 So-Called Dollar commemorates the Louisiana Purchase Exposition, a world fair held in St. Louis. These collectibles can vary in composition, design, and mintage, making them sought after by numismatists and collectors intrigued by American history.