|Centuries:||19th century – 20th century – 21st century|
|Decades:||1890s 1900s 1910s – 1920s – 1930s 1940s 1950s|
|Years:||1918 1919 1920 – 1921 – 1922 1923 1924|
Below is a partial list of numismatic events that occurred in 1921.
- Liechtenstein stops using the Liechtenstein krone and switches to the Swiss franc and the Liechtenstein frank.
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