Mercury Dime Key Dates - Mercury Keys List

The key dates in the Mercury Dime series are as follows:

• 1916-D - With a mintage of only 264,000 this is by far the rarest Mercury key



• 1942/1 (2 over 1 date) - Overdate type for both 1942 and 1942-D, mintages are unknown but the type is extremely rare
  
  

Semi-key (scarce) dates in the Mercury Dime series include:

• 1921
• 1921-D
• 1926-S
• 1931-S
• 1931-S

You can find our how much your dimes are worth if you sold them to a coin dealer today by checking my Mercury Dime Values Guide.