The DT 20, or Die Trial 20, is a type of pattern coin produced in 1854 in San Francisco, United States. These coins were struck primarily as experimental pieces to test designs and dies for official coinage, showcasing the artistic and technical capabilities of the mint during that period. Pattern coins like the DT 20 are highly sought after by collectors due to their historical significance and limited mintage, often representing transitional designs in American coinage. Patterns can differ greatly from standard coins, making them unique and valuable in the realm of numismatics.

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