Collectible coins encompass a wide range of numismatic items that are valued for their historical significance, rarity, condition, and demand among collectors. In the United States, the 25-cent quarter is a common denomination, with various designs and series created over the years. California Fractional Gold coins, minted in the mid-19th century, were small gold coins used during the California Gold Rush, often not recognized as official currency but sought after by collectors for their uniqueness and historical context. The designation "18721" likely refers to a specific coin or cataloging system associated with collectible coins.

Item Denomination Series Year Mint
18721-- (Unknown) California Fractional Gold 25¢ (Twenty Five Cents, Quarter) California Fractional Gold 18721 Unknown