Collectible coins, particularly those from the United States, are often sought after by numismatists for their historical significance, rarity, and condition. The designation "G 47 71" may refer to a specific grading system used to evaluate a coin's quality and preservation. F. D. Kohler was a prominent figure in coinage and minting during the 19th century, and coins minted in 1850, especially from the San Francisco Mint, are considered desirable due to their limited production and the historical context of California's Gold Rush. Collectors often value these coins based on their mint marks, rarity, and demand within the marketplace.

Item Denomination Series Year Mint
(1850) G$47.71 F.D. Kohler Ingot G$47.71 F.D. Kohler 1850 San Francisco