So-Called Dollars are a category of collectible coins that were issued primarily for commemorative purposes rather than for actual circulation. Originating in the United States, these tokens were named after the 1900 World's Fair "So-Called Dollars" cataloged by Harold E. Hibler and Charles V. Kappen. The 1931 So-Called Dollars commemorate various events, individuals, or organizations, often produced in a dollar size but not officially recognized as legal tender. Collectors value them for their historical significance, artistic design, and limited mintage.