So-Called Dollars refer to a category of numismatic items that are not official currency but were issued to commemorate events, places, or individuals in the United States. The term originates from the book "So-Called Dollars" by Hibler and Kappen, which catalogs these tokens and medals. One notable example is the 1854 So-Called Dollar, which is a commemorative issue associated with the California Gold Rush. The specific coin referred to as "Unknown" may indicate that its details, such as minting or design, are not well-documented or identified in existing numismatic literature.

Item Denomination Series Year Mint
1854 Ny Hk-8 Crystal Palace Sc$1 Ms Other / Varied So-Called Dollars - Hibler & Kappen 1854 Unknown