The 2015 United States Mint Silver Proof Set (14 coins) features stunning proof versions of regular-issue coins from the San Francisco Mint, all bearing the “S” mint mark. Seven coins are struck in 90% silver (five America the Beautiful quarters, Roosevelt dime, Kennedy half-dollar), while the other seven (four Presidential dollars, Native American dollar, nickel, cent) are clad or standard alloy. Total Silver weight: Approximately 1.3375 troy oz.