The 2017-S United States Limited Edition Silver Proof Set in Original Government Packaging (OGP) features a collection of uncirculated silver coins with a fineness of 0.999. Minted in San Francisco by the U. Mint, this set includes various denominations of coins struck in proof quality. Each coin is accompanied by a certificate of authenticity from the U. Mint, making this a highly sought-after and valuable addition to any coin collection.