what year are 50 cent pieces silver

[JayceRose]

Based on the provided information, the silver content of United States 50-cent pieces is entirely dependent on their year of mintage, falling into three distinct periods of composition.

For a significant duration of their history, specifically from 1836 through 1964, United States half-dollars were struck with a composition of 90% silver and 10% copper. This period encompasses several major designs, including the Barber (1892-1915), the Walking Liberty (1916-1947), the Franklin (1948-1963), and the inaugural 1964 Kennedy half-dollar. Any 50-cent piece dated 1964 or earlier is therefore composed of 90% silver.

A transitional phase occurred between 1965 and 1970. During these years, the U.S. Mint reduced the precious metal content of the Kennedy half-dollar. These coins are often referred to as silver-clad and possess an overall composition of 40% silver.

Beginning in 1971, the United States officially ceased the use of silver in all circulating 50-cent pieces. Half-dollars minted for general circulation from 1971 to the present are made from a copper-nickel clad composition and contain no silver. It is noteworthy, however, that the U.S. Mint has continued to produce special silver proof sets for collectors after 1971, which contain half-dollars struck in 90% silver but are not intended for general circulation.