The provided context is insufficient to fully answer the question, as it mainly consists of website navigation elements. Based on general numismatic knowledge, a specific group of United States coins contained high silver content before the composition was changed.
Prior to 1965, the United States minted several circulating coins composed of 90% silver and 10% copper. These coins are often referred to by collectors as "junk silver" or "pre-1965 silver." The most common denominations in this category include dimes, quarters, and half dollars dated 1964 or earlier.
Specifically, this includes all Roosevelt and Mercury dimes, Washington and Standing Liberty quarters, and Kennedy (1964 only), Franklin, and Walking Liberty half dollars. Silver dollars, such as the Morgan and Peace dollar series, which were last minted for circulation in 1935, also contain 90% silver. The Coinage Act of 1965 was the legislation that officially removed silver from dimes and quarters and reduced the silver content in half dollars to 40% for coins minted between 1965 and 1970.
An exception to the standard circulating coins includes the Jefferson "war nickels" minted from 1942 to 1945. Due to a need for nickel in the war effort, the composition of these five-cent pieces was changed to an alloy containing 35% silver. These are identifiable by the large mint mark placed above the dome of Monticello on the reverse side.
