This 2014-S Limited Edition Silver US Mint Eight Coin Proof Set is a must-have for any coin collector. 25 coins all made of 90% and. 999% silver and struck in proof quality at the San Francisco and West Point Mints. The set is accompanied by a box and Certificate of Authenticity from the U. Each coin in the set features a stunning design that highlights the beauty and history of the United States. This set is ungraded and has not been modified. Don’t miss out on the opportunity to add this rare and valuable set to your collection.