
The weight and composition of a United States silver half dollar are contingent upon its year of mintage. The provided information specifies the silver content for different eras of the Kennedy Half Dollar, which was first issued in 1964.
According to the documents, the 1964 Kennedy Half Dollar is composed of 90% silver. The silver content for this specific coin is 0.3617 troy ounces. The context also indicates that subsequent issues of the half dollar had different compositions, with some containing 40% silver and more modern versions containing no silver at all. Therefore, determining the weight of a silver half dollar requires identifying its specific mint year.


