We are pleased to offer for sale this 1921 Mercury Silver Dime KEY DATE. This 1921 Mercury Dime coin is circulated with a grading of G-4 or better. All of our circulated Mercury Silver Dimes have no major marks or visible problems (coins just have honest wear) and represent a great value for the price. This 1921 Mercury Dime is of great worth to the collector or numismatist that needs to fill a hole in their circulated Mercury Silver Dime set. The Mercury Dime weighs 2.50 grams and has a diameter of 17.9mm. Mercury Silver Dimes are composed of .900 silver and .100 copper for a net weight of .0734 oz. of pure silver.