Collectible coins, such as the United States quarter, represent a significant aspect of numismatics. The 25-cent quarter, particularly the Washington Quarters minted since 1932, are popular among collectors. The 1988 San Francisco mint issue is notable for featuring a "S" mintmark, indicative of its production at the San Francisco Mint. These coins often have variations in condition, rarity, and demand, influencing their collectible value.

Item Denomination Series Year Mint
1988-S (San Francisco) Washington Quarters 25¢ (Twenty Five Cents, Quarter) Washington Quarters 1988 San Francisco