So-Called Dollars refer to a category of numismatic items that are not official U.S. currency but are often made in the form of medallions or commemorative pieces. They gained popularity during the mid-19th century, particularly around significant events or anniversaries. The term is derived from the 1 SC (So-Called Dollar) designation from a reference book by Harold E. Hibler and Charles V. Kappen. The 1854 issue, for example, commemorates the opening of the U.S. Mint in San Francisco and features intricate designs that reflect the historical significance of the era, making it a sought-after collectible among numismatists.