No, it is 90% silver and 10% copper. Pure silver is too soft to use for circulated coinage.
If it has any wear at all, the value is just for the silver about $1.80.
A 1927 Mercury Head dime in average condition is $3.00-$5.00.
The 1964 Roosevelt dime is the most common of all silver dimes, it's worth about $2.00 only for the silver.
You can check the composition of a 1948 dime using a magnet. If the dime is attracted to the magnet, it likely contains iron and is not pure silver. A pure silver dime will not be attracted to a magnet.
All silver Roosevelt dimes are common, if it has any wear at all value is for the silver, about $1.25
In poor condition, the only value is in its silver content. At current prices, it's worth about $2.50.
If it has any wear at all the value is for the silver only about $1.00. A uncirculated 1942 dime is about $2.50
yes. all dimes up to 1964 are made of silver
The ASW (Actual Silver Weight) of all 90% US silver dimes is .07234oz
Yes, this is the Roosevelt design- introduced in l945 and still in use with non-silver content. The Mercury dime over its life-span was all silver- that is .900 fine.
The US never made pure silver dimes. Silver by itself is too soft for use in circulating coins. Dimes dated 1964 and earlier are made of a .900 fine alloy of silver and copper.
A platinum dime would be worth thousands of dollars ... except that there is no such coin. All 1964 dimes were made of 90% silver and 10% copper.