Collectible coins include various types, such as patterns and trial coins, which are often created as prototypes for potential circulation. In the United States, the Fifty Cents denomination, commonly known as the half dollar, has a rich history with several designs released over the years. In 1870, notable trial coins were struck, showcasing unique designs that were often never released for general circulation, making them highly sought after by collectors due to their rarity and historical significance. These trial pieces provide insight into the coinage process and the evolution of U.S. currency design.