Collectible coins are often categorized based on their material, rarity, historical significance, and design. The United States Mint produces a variety of coins, including the Gold Eagle series, which features the iconic designs of American symbology. The 2011 Gold Eagle coin, particularly the 10 Dollar denomination, contains a specific amount of gold, and coins minted in Philadelphia often bear a 'P' mint mark. Collectors value these coins for their metal content, artistry, and the potential for appreciation over time.