Collectible coins include various types such as bullion coins, commemorative coins, and proof coins, each appealing to different collectors. The United States Silver Eagle, introduced in 1986, is a popular one-ounce silver bullion coin featuring an iconic design by Adolph Weinman. Coins produced in specific years, such as the 1993 Silver Eagles, may hold additional value due to rarity or condition. Collectors often evaluate the grading and authenticity of these coins, with the designation "N A" potentially indicating a grade or classification used in specific catalogs or markets.