What kind of coins are 90% silver?
What U.S. Coins Contain Silver? All U.S. dimes, quarters, half dollars, and dollars, minted for circulation or in proof and mint sets, before 1965 has a metal content of 90% silver and 10% copper. In other words, coins minted from 1964 and back are silver coins, with the exception of copper cents, nickels and three cent nickels.
Are there any 40% silver quarter dollars in circulation?
A 40% silver quarter dollar was created for the United States’ bicentennial, but it was only available in Mint or Proof sets; it was never in general circulation. Some also lump 35% silver “war nickels” in when using the term 40% silver. Typically, Kennedy Half-Dollars and Eisenhower Silver Dollars are not considered for their numismatic value.