Collectible coins, particularly from the United States, include various types such as Patterns and Die Trials. Patterns are experimental coins created to test new designs or technologies, while Die Trials are examples produced to evaluate the striking process. The 1861 Patterns, specifically, refer to coins created during a period of significant change in American coinage, showcasing innovative designs that may not have entered regular circulation. Collectors value these pieces for their rarity and historical significance, often accompanying unique stories tied to the era.

Item Denomination Series Year Mint
1861 DT$2 1/2 Clark Gruber, Copper K-9 BN DT$2 1/2 Patterns & Die Trials 1861 Denver, Colorado