The silver content of the Kennedy Half Dollar is contingent upon its year of mintage, as the United States Mint altered its metallic composition over time. The coin has been issued in three primary compositions since its introduction.
Initially, the Kennedy Half Dollar minted in 1964 was composed of 90% silver. This high silver content was a continuation of the standard for circulating U.S. silver coinage at the time. However, this composition was limited exclusively to the inaugural year of the coin's production.
From 1965 through 1970, the composition was changed to a silver-clad structure. These coins contain a total of 40% silver, with an outer layer of 80% silver bonded to an inner core of 20.9% silver, resulting in a net silver content of 40%.
Beginning in 1971, the U.S. Mint eliminated silver from all circulating Kennedy Half Dollars, which were subsequently minted with a copper-nickel clad composition. It is important to note exceptions for collector-oriented issues. For instance, Bicentennial half dollars dated 1776-1976 were produced in both the standard copper-nickel clad for circulation and a 40% silver-clad version for collector sets. Furthermore, since 1992, special silver proof sets have been issued containing Kennedy Half Dollars with a 90% silver composition. Other modern commemorative and collector editions, such as those from 2014 and 2019 onwards, have been struck in 99.9% fine silver.
