According to this Wikipedia page, the US Silver Corporation (apparently now US Silver and Gold) is one of the largest producers of precious metal in the US. The 'art rounds' produced by USSC show a majestic eagle and a world map. They contain exactly one troy ounce of pure silver, so if you want to know how much they are worth, look up the value of one troy ounce of pure silver on web sites such as kitco.com.
Right now silver is trading around $22 US dollars per troy ounce, but tomorrow it will be different. The price of silver changes every day.
For more information on art rounds, click to this CoinQuest page. They make good vehicles to invest in silver, but there are better vehicles. The purity of the silver in a USSC art round is guaranteed by USSC. But the purity of silver in a US silver eagle coin is guaranteed by the US government. The guarantee adds value.