Silver coin with the Roman numeral III with stars around the edges and an olive branch above and a bundle of 3 arrows beneath is on one side, and on the opposite side is a six pointed star with an American shield inside of it and United States of America around the edges. The year, which is at the bottom center, has faded. It looks to me like it might be 1857. Very good.
Footnote: This was the smallest of United States silver coins, called the "trime" by the Treasury Department, and it was authorized by Congress, on March 3, 1851.