Collectible coins, particularly in the context of the United States, include various types such as patterns and trial coins. The 1804 silver dollar is one of the most famous examples, often referred to as "The King of American Coins." Patterns are coins struck under experimental conditions, typically not intended for general circulation, and provide insights into the minting processes of their era. The Philadelphia Mint is known for producing many significant collectible coins, including the aforementioned trial coins that were used to test designs and compositions before final production.

Item Denomination Series Year Mint
United States of America 1804 Philadelphia Patterns & Trial Coins $5 $5 (Five Dollars) Patterns & Trial Coins 1804 Philadelphia