Collectible coins, particularly in the context of the United States, can include a variety of types such as the Three Dollar Gold pieces and Peace Dollars. The Three Dollar Gold coin was minted from 1854 to 1889, making it a rare and sought-after item among collectors. Peace Dollars were produced from 1921 to 1935 and feature a depiction of Lady Liberty on the obverse and an eagle on the reverse. The 1921 Peace Dollar, minted in Philadelphia, is especially significant as it marks the series' initial release, widely popular for its historical value and aesthetic design.