2010-2020 US Mint SILVER Proof Sets, 139 Coins Total, 11 Complete Sets Over 14oz Of Silver. 2009-2020 US Mint Silver Proof Sets, 157 Coins Total, 12 Complete Sets. The 2009 Silver Proof Set contained the largest number of coins (18) and highest face value of any set to date. In 2019, the purity of the silver coins was changed to 99.9%. The 2019 Silver Proof Set also contains a bonus "West Point" penny with a reverse cameo finish -- the first W mintmark Lincoln ever produced. Similarly, the 2020 set includes a bonus reverse cameo "West Point" nickel.