The 1999-S US Mint Silver Proof Set includes 9 coins of high purity, each struck with a proof finish at the San Francisco Mint. This set comes in its original box with a Certificate of Authenticity from the U. Mint, making it a valuable addition to any coin collector’s portfolio. The set features coins of various denominations, all made of 90% silver, showcasing the quality and craftsmanship of American minting.