Collectible coins are often categorized based on historical significance, rarity, and demand among collectors. The United States twenty-dollar Liberty Head double eagle coins, minted from 1849 to 1907, feature a prominent depiction of Lady Liberty and are notable for their gold content. The 1855 Liberty Head double eagle is particularly sought after due to its limited mintage and the coin's overall condition. Collectors value these coins not only for their numismatic appeal but also for their role in American monetary history.