Collectible coins, especially within the context of the United States, encompass various types that appeal to numismatists and investors alike. A notable example is the Modern Commemorative Coin Sets, which include coins minted to honor significant events, individuals, or themes in American history. The 2005 set features several coins, including issues celebrating the 100th anniversary of the founding of the U.S. Army's 10th Mountain Division and the 50th anniversary of the U.S. Army's Veterans Day. These sets often contain both silver and gold coins, showcasing artistic designs and limited mintage that enhance their collectibility and value.