2020 United States Mint 10 Coin Silver Proof Set. Up for your consideration is a 2020 United States Mint 10 Coin Silver Proof Set that will come in its original mint box with COA. The set contains 10 coins. The 5 quarters and the dime and half are struck in. There is no reverse proof nickel with this set that you would get in a separate package. This is a very nice crisp set. He has contributed to numerous reference books within the industry, as well as being a co-author of The Comprehensive Catalog and History of Confederate Bonds, 2. Edition with Douglas B. He is an authorized submitter to NGC, PCGS, and PMG, a diamond founding member of Coin Dealers Helping Coin Dealers and a supporter of the Industry Council for Tangible Assets. American Coins and Collectibles can be found at many of the state and local coin shows. American Coins & Collectibles.