Collectible coins, such as the U.S. Gold Dollar series introduced in 1849, are highly sought after by numismatists and investors. The 1 One Dollar Gold pieces, particularly those minted in 1866, represent a significant era in American coinage history, as this was the year the design shifted to include the motto "In God We Trust" on certain coins. Gold Dollars are notable for their small size and intricate designs, including the Liberty Head and Indian designs, making them popular among collectors for both their aesthetic appeal and historical significance. These coins are typically graded for their condition and rarity, influencing their market value significantly.