Collectible coins refer to coins that are sought after for their rarity, historical significance, or aesthetic appeal rather than their face value. In the context of United States coins, the 10 Ten Dollars Gold Eagle series, introduced in 1986, features a design showcasing Lady Liberty and an eagle. The 2002 Gold Eagle coins produced at the Philadelphia Mint contain one-tenth of an ounce of gold and are composed of a gold, silver, and copper alloy. These coins are popular among collectors and investors for their precious metal content and iconic designs.