The 2012 Annual Silver Proof Set is a highly desirable collection featuring high-quality strike production, frosted devices, and deep mirror-like fields. With a shortened sales window originally capping out at just 7 months, the 2012 Silver Proof Set remains one of the most sought-after and lowest mintage sets from that decade. All 14 coins are beautifully sealed in official U. Coin Specifications & Checklist. 90% Silver Coins (7 Total). America the Beautiful Quarters: El Yunque (PR), Chaco Culture (NM), Acadia (ME), Hawai’i Volcanoes (HI), and Denali (AK). Clad & Base Coins (7 Total). Arthur, Grover Cleveland (1st term), Benjamin Harrison, and Grover Cleveland (2nd term). General Circulation: Lincoln Cent, Jefferson Nickel.