So-Called Dollars are a category of commemorative medals and tokens that were produced primarily in the United States, typically from the 19th and early 20th centuries. They often celebrate significant events, anniversaries, or notable figures and feature unique designs that are not found on official U.S. currency. Hibler and Kappen are authors recognized for their work cataloging these pieces, particularly in their book "So-Called Dollars." The term "So-Called Dollars" is derived from their resemblance to silver dollars in size and shape, despite being primarily non-monetary. Coins from 1940 or those marked "unknown" may refer to specific or less-documented editions within this broader collectible category.

Item Denomination Series Year Mint
1940 Ca Hk-483 Petroleum Dollar Sc$1 Ms Other / Varied So-Called Dollars - Hibler & Kappen 1940 Unknown