Collectible coins include various types such as bullion coins, commemorative coins, and rare numismatic coins. In the United States, the American Silver Eagle is a popular collectible coin, introduced in 1986, which contains one troy ounce of .999 fine silver. The 1990 Silver Eagle is part of the series that continues to garner interest among collectors due to its intrinsic metal value and mintage numbers. N A typically refers to coins that are not graded or ranked by a certification service.