This is a 2018 US Mint Silver Proof Set. The 2018-S United States Mint Silver Proof Set contains 10 coins in stunning proof condition displayed in three protective lenses. Each of these 2018-dated coins bears the “S” mint mark of the United States Mint at San Francisco. The quarters, half dollar and dime are struck in 90% silver, generally referred to as coin silver. The coins included in this set are. (5) quarters from the America the Beautiful Quarters Program. (1) Jefferson five-cent coin. This is a new set and it comes with the Original Packaging and COA.