2022 Silver Proof Set U. Mint Box COA 10 coin 5 American Women Silver Quarters. The 2022 United States Mint Silver Proof Set® contains 10 brilliant proof coins, each bearing the “S” mint mark of the UnitedStates Mint at San Francisico. The 2022 Silver Proof Set features five 99.9% fine silver proof quarters from the American Women QuartersT Program honoring.