This 2020-S United States Mint Silver Proof Set in Box with COA and Reverse Proof Nickel is a must-have for collectors. The set includes beautiful uncirculated silver coins with a fineness of 0.999, struck in San Francisco. The proof set contains coins with different compositions, including the Reverse Proof Nickel, which is a unique addition. The set is certified by the U. Mint and is perfect for anyone looking to add some rare and valuable coins to their collection.