Coins are not usually silver these days. Since the 1960s they have been made of copper and nickel. Silver coins from before 1965 in the US were 90% silver. Foreign countries have used anything from 40% to 92.5% silver in their coins, but to my knowledge, no one has used pure (100%) silver in currency.
The ASW (actual silver weight) is .18084oz pure silver.
0.999 silver means the silver is 99.9% pure.
Sterling is 92.5% pure silver, so there is 0.925 of a Troy ounce of pure silver in 1 Troy ounce if Sterling.
The coin has .77344oz of pure silver.
The US never used pure silver in circulating coins. It's too soft.
There is no such thing as a pure silver dime. See the related question below for more information.
The Actual Silver Weight (ASW) is .18084oz of pure silver.
.07234 oz of pure silver.
1873 to 1964 .18084oz pure silver
The actual amount of pure silver is .18084 of an ounce.
The 1964 Washington Quarter has .18084oz of pure silver.
A US silver dollar from 1840 to 1935 contains .77344oz of pure silver.