If you mean a 1921 high relief Peace dollar. Circulated coins are $125.00-180.00
Mint state coins start at $250.00
The intrinsic value is $14.16 with silver at $18.31 per ounce
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Assuming it's a more common Morgan dollar, about $13 for its silver content
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A average Mint State 1921 Morgan is $30.00-$40.00
The intrinsic value is $14.16 with silver at $18.31 per ounce
1922 silver dollar with closed eagle wings
A 1921 Half Dollar is 90% silver. It has a melt value of somewhere around $12. The related link below has more information.
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Assuming it's a more common Morgan dollar, about $13 for its silver content
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There is around .77 ounces in a 1921 US silver dollar.
A average Mint State 1921 Morgan is $30.00-$40.00
1921 is by far the most common date for Morgan dollars -- current value is about $17.00
There's a Peace dollar but not a war dollar. Please see the Related Question.
If the coin is a real Morgan or Peace dollar. The value is just for the silver, about $20.00.
There is no 1921 barber silver dollar, it is either a peace dollar (eagle perched on a rock engraved PEACE on the reverse) or a Morgan dollar (Eagle with gothic lettering above it saying "In God we Trust" on the reverse)