On Roosevelt dimes minted from 1946 to 1964, the mint mark position is on the back, at the bottom-left of the torch
Dimes from 1965 to 1967 do not have mint marks.
Starting in 1968 the mint mark position was moved to the front, above the date.
Possible letters are:
Blank = Philadelphia, 1946-79
P = Philadelphia, 1980-present
D = Denver
S = San Francisco 1946-55; proof coins only 1968-present
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The 1965 dime is a Roosevelt dime. This dime does not carry a mint mark and there were 1,652, 140,000 of them minted in the U.S. They have a value of between 10 cents and 2 dollars.
If you have a 1940 Roosevelt dime it is fake. The Roosevelt dime was not produced by the US Mint until 1946.
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No. The US Mint produced over nine hundred million 1968 Roosevelt Dimes without an "S" mint mark. Unless it is truly a Proof dime from San Fransisco. It would be more than likely in a proof, unopened set. Apparently, they produced the proof coin (which started in 1968 in San Fran) missing the mint stamp. They caught it but some got out I guess. I think that is where the confusion stems from. This coin didn't have a mint mark from one of the other mints.
There can't be a 1964-S Roosevelt dime because all coinage at the San Francisco Mint was suspended from 1956 to 1964 inclusive, and they didn't resume use of the S mint mark until 1968. You may be looking at the initials "JS" on the front of the coin - those are the monogram of John Sinnock, who designed the dime. Remember that up till 1964 Roosevelt dimes had their mint marks on the back side of the coin, at the bottom of the torch, and further that Philadelphia coins didn't have mint marks back then. There's more information at the Related Question.