The 1998-S U.S Mint Silver Proof Set is a valuable collection of coins that are all uncirculated and made of silver with a fineness of 0.9. These coins were struck in proof condition by the U.S. Mint in San Francisco. The set includes a variety of coins from the United States, each with a beautiful proof finish that makes them highly sought after by collectors. This set is a must-have for any coin enthusiast looking to add some rare and unique pieces to their collection.