1992-2021 30 Years of US Mint SILVER Proof Sets, 308 Coins Total, 30 Complete Sets Over 30oz Of Silver WOW!. 1992-2021 30 Years of US Mint Silver Proof Sets, 308 Coins Total, 30 Complete Sets. This set encompasses the entire 50 State Quarters run, as well as the 6 US Territories quarters and four 2009 Lincoln cent varieties. 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.