
Based on the provided information, it is important to clarify that United States 50-cent pieces intended for circulation were not made of pure silver. Instead, their composition varied by year.
The Kennedy Half Dollar with the highest silver content was minted in 1964. This particular coin is composed of 90% silver. The actual amount of silver in a 1964 Kennedy Half Dollar is 0.3617 troy ounces. Subsequent issues of the coin contained either 40% silver or no silver at all, depending on the year they were minted. Therefore, there is no "pure silver" 50-cent piece from standard US mintage.


