Collectible coins encompass a wide range of numismatic items, including historical coins, commemorative pieces, and medallic issues. The U.S. Mint produces various collectible coins and medals, such as those honoring significant events or individuals in American history. Notably, coins from the mid-19th century, like the 1855 Julian medals, often hold substantial collector interest due to their historical significance and rarity. The term "Unknown" may refer to specific varieties or issues that lack detailed documentation or provenance in numismatic literature.

Item Denomination Series Year Mint
(1855) J-Na-26 Av Commander Duncan Ingraham 102mm Other / Varied U.S. Mint Medals - Julian 1855 Unknown