U.S. quarters dated 1964 or earlier contain .18084oz of silver.
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U.S. quarters dated 1964 or earlier are 90% silver and 10% copper, they contain .18084oz of pure silver.
90%, or 2.25 grams.
Pre-1965 silver quarters are 90% silver with a total weight of 6.25 grams, which is then 5.625 grams of silver per quarter.
All pre-1965 U.S. coins were made of 90% silver and 10% copper. A standard silver quarter weighed 6.25 gm so that means it has about 5.6 gm of silver in it.
Same as post-1964 nickels: NONE. The only exception is for nickels minted 1942-45.