Collectible coins are items sought after by numismatists due to their historical significance, rarity, condition, and artistic value. In the United States, specific types of collectible coins include patterns, which are experimental coins created to test designs or manufacturing processes before official minting. One notable example is the 1849 die trial (also known as a pattern) from the San Francisco Mint, which exemplifies the early efforts to establish a coinage system in California during the Gold Rush era. These coins are often highly coveted by collectors for their unique characteristics and historical context.

Item Denomination Series Year Mint
1849 DT $2 1/2 Dubosq & Co. Copper Die Trial BN DT $2 1/2 Patterns & Die Trials 1849 San Francisco