Die Trials, also known as Patterns, are experimental coins created to test new designs or manufacturing techniques before official production. The DT 20, minted in 1854, is a notable example, showcasing early attempts to establish a standard for U.S. coinage. These coins are typically produced in limited quantities and are highly sought after by collectors due to their unique historical significance and rarity. The 1854 DT 20 represents a pivotal moment in U.S. numismatic history as it reflects the transition in coin design and production methods during that era.

Item Denomination Series Year Mint
(1854) DT$20 Kellogg & Co. Copper Die Trial BN DT$20 Patterns & Die Trials 1854 San Francisco