1970 for halves, 1935 for dollars (not counting a few silver Eisenhower dollars in the 1970s, which were for collector release only, instead of circulation).
40 percent silver coins are Kennedy Half dollars minted from 1965 through 1969. 1964 half dollars were 90% silver and coins dated 1971 and after have no silver. The 1970 half dollar was available only in mint sets
The US Mint still produces silver coins for collectors. The last year silver coins were produced for circulation was 1964 except for the Kennedy half dollar. These half dollars, minted from 1965 through 1970 contained 40% silver instead of the 90% contained in silver dimes, quarters, half dollars and dollar coins minted prior to 1965.
Franklin Half dollars are common coins. Because of this and the high price of silver, circulated coins are valued slightly above the silver content of the coin about $14.00.
Silver half dollar coins were discontinued for general circulation in 1964, when the U.S. Mint shifted to a copper-nickel composition due to rising silver prices. However, the last circulating silver half dollars, which contained 40% silver, were produced in 1970. After that, silver half dollars continued to be minted for collectors and special editions, but they were not intended for everyday use.
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).
Before 1970, half dollars had silver in them, but in 1970, they used no silver in the coins, so it is worth only $0.50.
An old half dollar minted before 1965 contains 90% silver and 10% copper. Specifically, the silver content in these coins is approximately 0.3617 troy ounces. Coins minted from 1965 to 1970, known as "40% silver" half dollars, contain about 0.1479 troy ounces of silver.
Silver. The CSA struck a tiny quantity of half dollars over standard US half dollars that were planed down, so the coins have the same 90% silver composition,
The 1964 Kennedy half dollar, which is 90% silver, contains 0.3617 troy ounces of silver. The 1965-1970 Kennedy half dollars (as well as some 1976 coins issued for collectors), which are only 40% silver, contain 0.1479 troy ounces of silver. The silver proof Kennedy half dollars produced for collectors since 1992 are, like the 1964 coins, 90% silver and contain 0.3617 troy ounces of silver.
More information is needed. There are two different one dollar coins that people call "silver dollars" dated 1986. Post new question.
US Dimes, Quarters and Half dollars dated 1964 and before are 90% silver. All US Dollar coins dated 1935 and before are also 90% silver.
No silver dollars were made in 1906, look at the back of the coin at the bottom for the words Half Dollar. It's likely a Barber half dollar, values for average circulated coins are $8.00-$14.00