1997 Proof Silver Set in Package with Certificate of Authenticity (COA) is an uncirculated set of coins with a composition of 90% silver. This set includes denominations of 1 cent, 5 cents, 10 cents, 25 cents, and 50 cents, all struck in proof condition at the San Francisco Mint. The set comes in its original packaging with a COA, ensuring its authenticity and value as a collectible item from the United States.