Do you mean the mint mark?
If so, look to the right of the word ONE on the back of the coin
blank = Philadelphia
D = Denver
S = San Francisco
a 1916-D mercury dime
Dime
If it's a U.S. dime with a date of 1944, it's a Mercury dime.
Please be more specific
The first MERCURY dime was struck in 1916
The Mercury Dime
The Winged Liberty Head Dime also known as the Mercury Dime was minted from 1916-1946.
The U.S. Mint did not issue a Mercury Dime in 1910.
The Winged Liberty, or Mercury Dime. Most people call it the Mercury Dime, but its real name is the Winged Liberty dime.
Do a Google image search for "Mercury Dime" and you will see the photo of the dime.
That's off by about 65 years. Mercury dimes were minted from 1916 to 1945. A dime from 1853 would be called a Liberty dime or Liberty Seated dime.
A mercury dime has a face of a personification of liberty on it with a winged helmet. They are called mercury dimes because it looks like Mercury from mythology.