Ancient history

How do you know if have a 1916d dime silver coin or its 1916s?

1916-D (Denver) dime:

- No mint mark on the reverse (tail's side) below the eagle.

- "D" mint mark below the date on the obverse (head's side), signifying the Denver mint facility.

1916-S (San Francisco) dime:

- "S" mint mark on the reverse below the eagle.

- No mint mark on the obverse.