So-Called Dollars are a type of exonumia, primarily consisting of medals and tokens that resemble dollars but are not official currency. They often commemorate significant events, people, or themes related to the United States. The term "So-Called Dollars" originates from the work of numismatist Harold S. S. Johnson, who cataloged these items. The 1955 So-Called Dollar issue features various designs and themes, showcasing the artistic diversity and commemorative nature of these collectibles, appealing to both numismatists and historians.