On 23 January 2020 Swissmint released a new type of gold collector coin, dedicated to eminent physicist Albert Einstein. The coin is the smallest machine-minted gold coin in the world. Measuring only 2.96 millimetres in diameter and with a weight of 0.063 grams, the .999 pure gold coins carry a legal tender denomination of 1/4-franc (or 1/500 ounce). Because the image on the minted sides cannot normally be seen with the naked eye, Swissmint has commissioned special packaging complete with magnifying lenses and a light source, ensuring that each coin can be examined while still keeping it safely stored.
The coins are, obviously, not meant for circulation so are classified as Non-Circulating Legal Tender (NCLT) targeted at collectors.