Look on the back of the coin to see if there's a small mint mark letter. It may be blank or there may be an S.
Numismedia lists the following approximate retail values as of 06/2014:
No mint mark (Philadelphia):
Very worn condition - $12
Moderately worn - $15
Slightly worn - $20
Almost no wear - $78
Uncirculated - $144 to $12,810 depending on quality
"S" mint mark (San Francisco):
Very worn - $16
Moderately worn - $35
Slightly worn - $48
Almost no wear - $322
Uncirculated - $660 to $10,160
DISCLAIMER: The retail values quoted are the best available as of the date shown, but may vary significantly due to changes in the precious metals market. Also the wholesale (buying) price of a coin will be less than the selling (retail) price. A reputable coin dealer will be able to give a more accurate valuation based on inspection of the coin.
The value of a US dime marked "ten centavos" is zero, since it is a fake. A real US dime is marked "one dime," not "ten centavos."
a 1917 us dime is called a mercury dime. its not that rare so it is worth about a dollar
Face value only.
The mercury dime was minted between 1916 and 1945. The 1884 dime is a seated liberty. You can find reasonably close values to just about any coin on eBay in the sold section of coin in question. Also please see the Related Question for some additional information.
The US discontinued its half-dime denomination in 1873.
what is the value for an American 1909 silver dime
The value of a US dime marked "ten centavos" is zero, since it is a fake. A real US dime is marked "one dime," not "ten centavos."
a 1917 us dime is called a mercury dime. its not that rare so it is worth about a dollar
A 1988 dime is worth 10 cents.
Face value only.
10 cents
10c
The mercury dime was minted between 1916 and 1945. The 1884 dime is a seated liberty. You can find reasonably close values to just about any coin on eBay in the sold section of coin in question. Also please see the Related Question for some additional information.
The US discontinued its half-dime denomination in 1873.
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.
A US dime dated 1944 is a Mercury head dime, it's very common with a value of $2.00 just for the silver.
The British have never produced a "Dime" coin. The "Dime" is a US 10 cent coin.