What is the value of Mercury dimes?

The process involves identifying the date, mintmark, and grade of the coin, then looking it up on a value chart. The date is on the front, on the right side. The mintmark, if it has one, is on the back, near the rim, at about 7 o'clock. It will be either a "D , an "S", or nothing. Grading of these coins is explained here : http://www.coincentric.com/GradingMercuryDimes.htm An online retail price guide can be found here : http://www.numismedia.com/fmv/prices/mrcdim/pricesgd.shtml