
Based on the provided information and standard numismatic specifications, a 90% silver half dollar has a total weight of 12.5 grams. These coins are composed of 90% silver and 10% copper.
The provided context for the 1964 Kennedy half dollar, which is a 90% silver coin, specifies that its actual silver content is 0.3617 troy ounces. This figure represents the weight of the pure silver within the coin, not the coin's total gross weight. Other U.S. half dollars minted for circulation before 1965, such as the Walking Liberty and Franklin half dollars, also adhere to this 90% silver composition and weight standard.


