Collectible coins, especially within the context of the United States, include various types such as bullion coins, numismatic coins, and commemorative coins. The American Silver Eagle is a notable example, introduced in 1986, featuring a design that highlights the Walking Liberty motif on the obverse and an eagle on the reverse. These coins contain one troy ounce of 99.9% pure silver and are highly sought after by both investors and collectors. The ten-dollar gold coins from the U.S., such as the Indian Head and Liberty Head designs, also hold significant historical and collectible value.