Totally depends on condition. Both of those dates are pretty common, unless they are in extremely good condition...they aren't worth more than a couple dollars each. They are both 90% silver so they do have some intrinsic metal value way above face. A photo will help us give you a better idea of the value. Also, just so you know...the 1939 is called a "Mercury Dime" and the 1958 has FDR on it so it's called a "Roosevelt Dime."
