Barber, Walking Liberty, Franklin, and 1964 Kennedy halves weigh 12.5 gm and were made of 90% silver, so they contain 11.25 gm of pure silver.
1965-70 Kennedy halves weigh 11.5 gm and are 40% silver.
All 1971 and later circulating half dollars are made of copper-nickel, not silver.
12.50 grams for a silver half dollar
There is no silver in a 1972 US half dollar.
An 1870 US Half Dollar weighs 12.44grams and is 90% silver, giving it an ASW (Actual Silver Weight) of 11.196 grams or 0.36 troy ounces.
There are .1479 troy ounces of silver in a 1967 US Kennedy half dollar.
There are .3617 troy ounces of silver in a 1958 Franklin half dollar.
There are .3617 troy ounces in a 1962 US half dollar.
No. Not a single US coin made the US mint is 100% silver. 1969 US half dollar are made of a 40% silver.
If the coin is a US Kennedy half dollar dated 1974 it has no silver in it and is face value.
No US silver dollars were made after 1935, look at the back of the coin for 'Half Dollar'.
Please check the coin's date and denomination US silver dollar production was suspended between 1905 and 1920 inclusive, so there are no 1917 dollar coins. If your coin says HALF DOLLAR on the back, it's a half dollar, not a silver dollar.
With a date of 1979 the coin has no silver in it. 1969 was the last 40% silver circulating US half dollar. The coin is worth 50 cents.
A US half dollar with a date of 1979 is a Kennedy half dollar not a liberty half dollar. The coin has no silver and is only face value.