Collectible coins encompass various types, including historical, commemorative, and bullion coins. In the United States, the 20-dollar gold coins, particularly the Liberty Head series, are notable for their design and historical significance. Braided Hair Cents, produced in 1849, feature a unique design that adds to their appeal among collectors. The designation "N A" likely refers to the coin's grading or certification status, indicating its condition and authenticity, which are crucial factors in determining value.