Collectible coins encompass a wide range of items sought after by numismatists, including historical pieces, limited mintage coins, and error coins. Among these, trial coins serve as experimental pieces tested for design and production quality before the official release. The 1804 dollar is among the most famous U.S. coins, known for its rarity and historical significance. Minted in Philadelphia, it is often referred to as the "King of American Coins" due to its desirability and high auction prices. Patterns are also notable in the collectible coin realm, representing proposed designs that were never adopted for general circulation.

Item Denomination Series Year Mint
1804-P (Philadelphia) Patterns & Trial Coins Other / Varied Patterns & Trial Coins 1804 Philadelphia
1804-P (Philadelphia) Patterns & Trial Coins Other / Varied Patterns & Trial Coins 1804 Philadelphia