That's not a mint mark. It's the monogram of the designer A.A. Weinmann. The West Point Mint did not open until the 1980s and only strikes commemorative coins and cents.
Mercury dimes had their mint mark in the space to the right of the word ONE on the dime's back. For a 1942 dime it will either be blank (Phila.) or have a small "S" for San Francisco, or a "D" for Denver.
a 1942 Mercury Head dime is very common, if it has any wear the value is for the silver about $2.00.
Mercury Head dimes dated from 1940 to 1945 regardless of mintmarks (if any) are very common. Coins in average circulated condition have a retail value of $3.00
Look at the date again, the first Mercury Head dime was made in 1916. Post new question.
Please check again and post a new question. Mercury head dimes were made from 1916 to 1945.
A Mercury Head dime date 1926 with no mintmark has a retail value of $2.50 to $6.00 for a coin in average circulated condition.
a 1942 Mercury Head dime is very common, if it has any wear the value is for the silver about $2.00.
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
Mercury Head dimes dated from 1940 to 1945 regardless of mintmarks (if any) are very common. Coins in average circulated condition have a retail value of $3.00
The "aw' you see is just the monogram of the designer Adolph Weinman, it's on every Mercury head dime. 1942 is a very common year so if the coin shows any wear at all the value is about $2.00 just for the silver.
A 1927 Mercury Head dime in average condition is $3.00-$5.00.
Look at the date again, the first Mercury Head dime was made in 1916. Post new question.
Copy and paste this info ( 1942/1941 Mercury dime over date ) to the search box on your browser, click images then search. It will bring up pictures of this coin.
1943 is a very common Mercury Head dime. Most are only valued for the silver, about $2.00.
Please check again and post a new question. Mercury head dimes were made from 1916 to 1945.
A Mercury Head dime date 1926 with no mintmark has a retail value of $2.50 to $6.00 for a coin in average circulated condition.
If it has any wear at all, the value is just for the silver about $1.80.
Please check again and post a new question. There is no such coin - Barber dimes were minted from 1892 to 1916.Mercury dimes were issued from 1916 to 1945.