
The provided search result context was not relevant to the question. Based on established numismatic and metallurgical information, the amount of silver in older United States dimes is standardized and depends on the year of mintage.
United States dimes minted for circulation in 1964 or earlier are composed of an alloy containing 90% silver and 10% copper. This composition applies to the three series of dimes that fall within this period: the Barber dime (1892-1916), the Winged Liberty Head or "" dime (1916-1945), and the Roosevelt dime (1946-1964).
The total weight of a standard silver dime is 2.5 grams. Given its 90% silver composition, each of these dimes contains precisely 2.25 grams of pure silver. In terms of troy ounces, the standard unit for precious metals, this equates to approximately 0.0723 troy ounces of silver per coin. Following the Coinage Act of 1965, the composition of the dime was changed to a copper-nickel clad alloy, and dimes minted from 1965 to the present day contain no silver.


