So-Called Dollars are a specific category of medals and coins that were produced to commemorate specific events or significant figures, particularly in the United States during the late 19th and early 20th centuries. The term originated from a series of pieces designed to resemble U.S. dollars, but they were not legal tender. The 1907 So-Called Dollars typically reference events like the Panama-Pacific International Exposition, which celebrated the opening of the Panama Canal. These collectibles are notable for their unique designs and historical context, appealing to numismatists and historians alike.