Collectible coins, often referred to as numismatic coins, encompass various types such as bullion coins, commemorative coins, and rare historical coins. In the United States, collectible coins include those produced by the U.S. Mint, like the American Eagle and American Buffalo coins, as well as limited-edition releases. The value of these coins is often determined by factors such as rarity, demand, metal content, and condition. The term "DT 50" likely refers to a specific grading standard or a reference to a collection or series, but further context is needed for precise identification.

Item Denomination Series Year Mint
1855 DT$50 Kellogg & Co. Copper Die Trial BN DT$50 Patterns & Die Trials 1855 San Francisco