when did they stop making half dollar coins
90% Silver Dimes, Quarters, and Half Dollars. Roosevelt and Mercury Dimes, Washington Quarters, and Walking Liberty Franklin and Kennedy Half-Dollars minted in 1964 and earlier are 90% silver. The value of most circulated coins minted in the 1920â²s through 1964 is primarily from their silver content. Remember, this is for the most common material.