Collectible coins are often categorized by their historical significance, rarity, condition, and demand among collectors. The United States has produced various types of collectible coins, including the Three Dollar Gold Piece, introduced in 1854, which features a design known as "Liberty Head" and was minted until 1889. The Braided Hair Cent, designed by Joseph Head and minted from 1840 to 1857, reflects a transitional style in U.S. coinage, emphasizing Liberty’s flowing hair. The year 1849 marks the introduction of the Gold Rush-era, influencing the design and minting of coins during that period.