The 2018 US Mint San Francisco Silver Reverse Proof Set + 2020 Silver Proof Set with 5c denomination includes uncirculated silver coins with a fineness of 0.9. These proof sets are minted in San Francisco by the United States Mint and come with certification from the U.S. Mint. The set includes coins from the year 2018 and 2020, struck with a proof finish, making them ideal for collectors and coin enthusiasts looking for high-quality silver coins.