The silver content of Kennedy half dollars is as follows:
1964 Kennedy half dollars: 90% silver and 10% copper.
1965 through 1970 Kennedy half dollars: 40% silver and 60% copper
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Did you get many 1964s? Though the 1965 through 1970 Kennedy half dollars have enough silver, to make them worthwhile for you, to scoop up that free silver.
Score!
Just an anecdotal aside on the Biden economy....I have yet to see a nickel or dime from 2024. Usually, I see them by April.