Are all coins before 1964 silver?

Not all coins minted before 1964 are made of silver. In the United States, for example, only certain denominations, such as dimes, quarters, and half dollars issued before 1965 contained 90% silver. Other coins, like pennies and nickels, were primarily made from copper or a copper-nickel alloy during that time. Therefore, while many older coins do contain silver, it is not a universal characteristic for all coins before 1964.