Modern commemorative coins are collectible pieces issued by the United States mint to mark significant events, individuals, or themes in American history. The 2006 San Francisco Mint set includes coins that commemorate various aspects of American culture and heritage, showcasing special designs and finishes. These coins often appeal to numismatists due to their limited mintage and thematic significance, making them valued items for collectors. The one-cent (1c) coin, among others in the set, can exhibit unique features indicative of its specific commemorative purpose.