
The 1916-D Mercury Dime is the key date of the Mercury series with a mintage of 264,000 coins. In 1916, the Philadelphia Mint made 22,180,080 coins and the San Francisco Mint, 10,450,000. Those two other mintages are important because scammers began added a mintmark to Philadelphia coins that year. Many also altered 1916-S dimes to make that mintmark look like a D.
Fortunately, we know much about the Denver mintmark. For starters, the Mint used the same punch tool for the 1916-D as it did for the coveted 1914-D Cent.

Look closely: The outer shape of the D is squared off rather than rounded. And the cavity inside the D has a vague triangular shape rather than oval.
Four reverse dies were used on the 1916-D Dime. If your coin deviates from these positions, it is fake.
Jack D. Young has a great Proxiblog article on fake 1916-Ds offered on eBay. He made this graphic below, which we use here. Take a photo of your 1916-D coin or a screenshot if you are considering purchasing one and then compare.

Two of the four genuine reverse dies feature a repunched mint mark (Dies 2 and 3 above).
Here is the example used earlier but now identified.

Genuine 1916-D Dimes often have tiny die scratches or die cracks near the date on the obverse.

It is important to know markers of rarities in coin collecting. Otherwise you may end up with a counterfeit or replica if not holdered by a major company like PCGS or NGC. Be sure to check out our rarity tab for markers of our most desirable coins.

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