Collectible coins refer to coins that are valued for their rarity, historical significance, or unique features rather than their face value. In the context of United States coins, the 1 One Dollar Gold Dollar series includes coins minted in the mid-19th century, specifically from 1849 to 1889. The Charlotte Mint, which operated from 1837 to 1861, produced Gold Dollars in 1850, making them particularly sought after by collectors due to their limited mintage and historical context related to the Gold Rush era. These coins are often graded based on their condition, provenance, and market demand.