Collectible coins, particularly in the context of the United States, include a variety of items such as patterns and trial coins. Patterns are experimental coin designs struck to test new concepts or technologies, while trial coins are struck to evaluate production processes. The 1859 one-dollar pattern coin is notable among collectors for its unique design and historical significance, often sought after for its rarity and aesthetic appeal. These coins can carry significant value due to their limited mintage and the stories they represent in the numismatic community.