Half dollars were never made of solid silver. It's far too soft to use in a circulating coin. US halves were made of 90% silver and 10% copper up till 1964, and 40% silver from 1965 to 1970. Since then all circulating half dollars have been made of copper-nickel, like dimes and quarters.
Special collectors' half dollars have been struck in silver during other years. Some 1976 Bicentennial halves were made in 40% silver, and since 1992 "Prestige Proof" halves, dimes, and quarters have been struck in the original 90% silver composition.
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They were never pure silver, but all half dollars (as well as dimes and quarters) 1964 and earlier are 90% silver.
walker half dollars were minted from 1916 to 1947. they were always made of 90% silver
All types of half dollars from 1964 & older were made of 90% silver & 10% copper, from 1965-1970 half dollars were made using 40% silver, and 1971 to present the Kennedy half dollars are made of 91.67% copper & 8.33% nickel
1964 was the last year for 90% silver half dollars, 1965-1970 half dollars were 40% silver 1971 to date are Copper Nickel alloy.
All 90% silver half dollars are about $10.00 just for the silver.