None of these are silver, or have been since 1964.
none of these are valuable in average circulated condition
Half dollars minted before 1965 are 90% silver, and those from 1965-70 are 40% silver. Then with silver dollars, the last year for ones with actual silver in them was 1935 (there were no dollar coins from 1936 to 1970).
1964 was the last year for 90% silver half dollars, 1965-1970 half dollars were 40% silver 1971 to date are Copper Nickel alloy.
1964 was the only year for a 90% silver Kennedy, 1965 to 1970 are 40% 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
Kennedy half-dollars minted 1965-1970 are 40% silver, so those are worth something. Then certain Eisenhower dollars minted in San Francisco also contain silver, but those were never released into circulation, but rather sold to collectors.
There were no silver dollars minted from 1936 through 1970. There wasn't a need for more to be made.
There were no US silver dollars struck in 1970. Silver was removed from all circulating US coinage in 1965 and the Eisenhower dollar (which contained no silver but was the same size as the old silver dollars) wasn't first struck until 1971.
President Eisenhower
1964 for 90% silver, and 1970 for 40% silver.
U.S. half dollars minted in 1965 through 1970 weigh 11.5 grams and contain 40% silver.
1964 for dimes, quarters, and 90% silver half dollars, and 1970 for 40% silver half dollars.
All Dollar coins issued for circulation from 1971 to date contain no silver All Dollar coins issued from 1794- 1935 are 90% silver. In the years of 1936-1970 no one dollar coins were struck.