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dime = 10 cents
June 4 2011 A 1942 Mercury dime with no mint mark in MS-65 condition is worth an average of $22 One with a D mintmark is worth an average of $22 in MS-65 condition. One with a S mintmark is worth an average of $25 in MS-65 condition.
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.
The coin is so common most are valued for the silver only at about $1.00
The 1945 nicro S Mercury Dime is 90% Silver Mercury Dime that was minted in San Francisco. San Francisco used different types of punches in 1945.