As of 2014, the most valuable Mercury head dime is an uncirculated 1916 dime minted in Denver. With only 264,000 ever produced, the 1916-D coin is extremely rare and valued anywhere from $600 to more than $30,000 depending on its condition.
Coin collectors set the value of a specific coin based on its condition, labeled as good, fine, extremely fine, or uncirculated. The Denver dime is worth significantly more than the much more common 1916 dimes minted in Philadelphia and San Francisco. After the 1916-D, the most valuable Mercury head dimes are the 1921, the 1921-D, the 1926-S, the 1919-D and the 1925-D.