However, the Roosevelt dime,
Which coins are real silver?
Roosevelt and Mercury Dimes, Washington Quarters, and Walking Liberty Franklin and Kennedy Half-Dollars minted in 1964 and earlier are 90% silver. The value of most circulated coins minted in the 1920′s through 1964 is primarily from their silver content. Remember, this is for the most common material.
How can I tell if a coin is silver?
The best way to determine if your coins are silver is to view the edge of the coin. If the coin has a solid silver stripe, then you can feel confident that it's silver. If you can see a copper stripe, then the coin is clad. A more subdued silver stripe with faint traces of copper could mean that the coin is 40% silver.