The only US dimes ever minted at West Point were issued in 1996 to mark the 50th anniversary of the Roosevelt design. They were only available to collectors and weren't put into circulation, although it's possible some "escaped" if someone broke open the package they came it. As of 06/2011 these coins sell for $3 to $45 depending on quality.
But if you're referring to a Mercury dime, the "W" on the front isn't a mint mark at all. It's the initial of the coin's designer, A. A. Weinman, and is on ALL Mercury dimes so it doesn't affect their value in any way. What matters is the coins' dates, mint marks, and conditions. Please check out questions in the form "What is the value of a <date> Mercury dime?" for specific values.
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.
10 cents, they are in common circulation, prior to the 1980s dimes struck at the Philadelphia mint had no mintmark.
The coin is so common most are valued for the silver only, about $1.00
Assuming no mint mark this coin has a retail value of $4.00 to $6.50 in collectible circulated condition with a bullion value of about $4.00.
In 1961 the mint mark position was on the back of the coin next to the base of the torch. No mint mark = Philadelphia; D = Denver What you're interpreting as "US" on the front is actually JS, the monogram of the designer John Sinnock.
JS isn't the mint mark, but rather the initials of John R. Sinnock, Chief Engraver of the U.S. Mint. A 1950s dime will have a D for Denver, S for San Francisco, or no mint mark for Philadelphia (a P mark wasn't added until the 1980s). 1956 is a common date, currently worth about $2 for the silver.
The was coin made at the Philadelphia Mint that is why it has no mintmark, 1980 was the first year that US dimes had "P" mintmarks. This coin is still in circulation and is face value.
As of 08/2008 With no mint mark, $14 to $25 depending on how worn it is. With an O, $25 to $150.
The most valuable is a error coin, the 1982 dime with no P mint mark. It has a value of $110.00
The only US coins to carry a C mintmark were gold coins struck at the Charlotte Mint from 1838 to 1861. The mint mark position on a 1950 dime is on the back at the bottom of the torch: No mint mark = Philadelphia D = Denver S = San Francisco There's more information at the Related Question.
The value of the more common dates among Roosevelt dimes is based on their silver content rather than their mint mark(*) Regardless of mint mark, a 1959 dime is worth about 0.072 times the current price of silver which can be found in the business section of a newspaper or at a site such as kitco.com/ (*) See the related question for info about mint marks
Please check again. The US only minted dimes at Philadelphia (no mint mark) and San Francisco (S)