The 1990 S United States Mint proof set includes 5 uncirculated coins with a mixed composition, struck in proof quality at the San Francisco Mint. This set comes with the original government packaging and certificate of authenticity from the U.S. Mint, making it a highly sought-after collector's item for coins and paper money enthusiasts in the United States. Each $5 denomination coin in the set is guaranteed to be in pristine uncirculated condition, adding value to any coin collection.