
Based on numismatic specifications for United States coinage, the 40% silver half dollar refers to the Kennedy half dollars minted from 1965 through 1970. These coins were produced with a clad composition, consisting of an outer layer of 80% silver and 20% copper bonded to an inner core that brings the coin's total silver content to 40%.
The total mass of a 40% silver half dollar is 11.50 grams. To determine the amount of pure silver contained within the coin, one must multiply the total mass by its silver purity. The calculation is 11.50 grams multiplied by 0.40, which yields an actual silver weight of 4.6 grams.
In the context of precious metals, weight is conventionally expressed in troy ounces. Given that one troy ounce is equivalent to approximately 31.1035 grams, the 4.6 grams of silver in a 40% half dollar converts to approximately 0.1479 troy ounces of pure silver. This figure represents the intrinsic metallic value of the coin, distinct from any numismatic or collectible value it may possess.


