Collectible coins, especially within the context of the United States, encompass a wide variety of types, including patterns and trial coins. The 1 One Dollar coins, particularly prototypes or patterns from 1876, are highly sought after by numismatists due to their historical significance and rarity. These patterns often represent experimental designs that were not intended for circulation, making them especially valuable. The notation "N A" typically indicates a specific grading or categorization reference within collections. Overall, such coins serve as important artifacts of American monetary history.