Collectible coins encompass a variety of numismatic items, including patterns and die trials, which are experimental coins made to test designs or minting processes. The 1851 California patterns are a notable example from the United States, created during the California Gold Rush and intended for potential circulation. These coins exhibit unique designs and are highly sought after by collectors due to their historical significance and rarity. The term "DT 2 1 2" likely references a specific type or variety of these patterns within a cataloging system used by numismatists.

Item Denomination Series Year Mint
1851 DT$2 1/2 State of California Die Trial BN DT$2 1/2 Patterns & Die Trials 1851 California