Collectible coins can include various types such as commemorative coins, bullion coins, and mint sets. The United States Mint issues collectible coins, including those with a denomination of 25 cents (25c), which may be part of specific series like the State Quarters or America the Beautiful quarters. In 2013, the U.S. Mint released special mint sets that feature uncirculated coins from that year, often sought after by collectors for their quality and limited availability. These mint sets typically include coins from various denominations, showcasing the craftsmanship and design efforts of the U.S. Mint.