See the related question about mintmark locations.
The first MERCURY dime was struck in 1916
No dimes were struck in 1922.
The 1943 Mercury dime was struck between 1916 and 1945. Struck .900 silver, it's callec the mercury dime because people thought the liberty image looked like Mercury, roman god of speed. Surprisingly, they have very little value now.
7-2-11>>> The last Mercury dime was struck in 1945. A 1958 dime is a Roosevelt dime (1946 to date) and is common, most are only valued for the silver, about $2.00
With a date of 1912 it's not a Mercury dime, it's a Barber dime. The first Mercury dimes were struck in 1916. Assuming the coin is in average circulated condition and has no mintmarks, value is $3.00-$6.00.
Mercury dimes were struck from 1916-1945. A 1907 dime is called a Barber (1892-1916) dime. It's a common date coin with a average value of $3.00.
One way is to compare it to a picture of a Mercury dime. Another way is to simply check the date on it. If it's dated anywhere from 1916 to 1945, it's a Mercury.
All Mercury dimes are 90% silver and 10% copper. They were struck from 1916 to 1945.
It would be extraordinary because the first Mercury dimes weren't struck until 1916. If you have a BARBER dime, see the Related Question for more information.
For the 1918 Mercury dime, in average condition values are $3.00-$7.00. Look at the date on the other coin again, no dimes were struck in 1932.
The first MERCURY dime was struck in 1916
That would be pretty difficult to tell you, because the last Barber dimes were struck in 1916.Now if you have a so-called "Mercury" dime from 1943, it's worth about $1 in average condition, regardless of mint mark.