1921 is one of the rarer years for Mercury dimes. Look on the back of the coin to see if there's a small mint mark letter next to the E in ONE. It may be blank or there may be a D (The W on the front of the coin is the designer's monogram and not a mint mark.)
Numismedia lists the following approximate retail values as of 03/2013:
No mint mark (Philadelphia):
Very worn condition - $54
Moderately worn - $112
Slightly worn - $282
Almost no wear - $868
Uncirculated - $1,260 to $4,440 depending on quality
"D" mint mark (Denver):
Very worn condition - $68
Moderately worn - $162
Slightly worn - $366
Almost no wear - $1,106
Uncirculated - $1,410 to $4,710
DISCLAIMER: The retail values quoted are the best available as of the date shown, but may vary significantly due to changes in the precious metals market. Also the wholesale (buying) price of a coin will be less than the selling (retail) price. A reputable coin dealer will be able to give a more accurate valuation based on inspection of the coin.
If it's a US 1921 Mercury head dime, minimum value is $40.00, take it to a coin dealer for a better idea of value. It needs to be seen for an accurate assessment.
The first MERCURY dime was struck in 1916
dime = 10 cents
The Mercury dime dated 1921 is a semi-key coin with good values in the circulated grades that run from $54.00 to over $200.00 just in the first four grades. I suggest having it graded by a collector or dealer for a better idea of value.
The US never minted a flowing-hair dime. A dime from 1937 would be a Winged Liberty dime, normally called a "Mercury" dime because the wings on Miss Liberty's cap make her resemble the Roman god Mercury. Please see the question "What is the value of a 1937 Mercury dime?" for more information.
If it's a US 1921 Mercury head dime, minimum value is $40.00, take it to a coin dealer for a better idea of value. It needs to be seen for an accurate assessment.
The first MERCURY dime was struck in 1916
dime = 10 cents
The Mercury dime dated 1921 is a semi-key coin with good values in the circulated grades that run from $54.00 to over $200.00 just in the first four grades. I suggest having it graded by a collector or dealer for a better idea of value.
A 1926 Mercury dime is common, average value is $3.00-$6.00 depending on the condition of the coin.
Mercury dimes were struck from 1916-1945. A 1907 dime is called a Barber (1892-1916) dime. It's a common date coin with a average value of $3.00.
Now. Check the following link for Mercury dime prices.
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.
The US never minted a flowing-hair dime. A dime from 1937 would be a Winged Liberty dime, normally called a "Mercury" dime because the wings on Miss Liberty's cap make her resemble the Roman god Mercury. Please see the question "What is the value of a 1937 Mercury dime?" for more information.
A '44 Mercury dime is worth about $2.50.
Mercury dimes were minted from 1916 to 1945. Your coin is called a Barber dime, after its designer Charles Barber.
Look at the date again, the first Mercury Head dime was made in 1916. Post new question.