The best thing to do is get a copy of "Red Book" from your local coin dealer or book store or find one of the many on-line price guides.
Peace dollars were made from 1921 to 1935. An 1879 silver dollar is called a Morgan dollar after its designer George T. Morgan. There's more information at the Related Question
Of all the Morgan dollars, the 1921 coins are the highest mintage most common. Regardless of mintmarks, values for circulated coins are $31.00-$40.00.
Of all the Morgan dollars the 1921 coins are the highest mintage most common. Regardless of mintmarks, values for circulated coins are $16.00-$19.00.
The New Orleans Mint struck Morgans from 1879-1904. None were struck in 1878 & 1921
7-4-11>>> Of all the Morgan dollars the 1921 coins are the highest mintage most common. Values for circulated coins are $35.00-$41.00.
Peace dollars were made from 1921 to 1935. An 1879 silver dollar is called a Morgan dollar after its designer George T. Morgan. There's more information at the Related Question
Of all the Morgan dollars the 1921 coins are the highest mintage most common. Regardless of mintmarks, values for circulated coins are $22.00-$25.00.
Of all the Morgan dollars the 1921 coins are the highest mintage most common. Regardless of mintmarks, values for circulated coins are $16.00-$19.00.
The 1921 Morgan is the highest mintage, most common of all Morgan dollars. Retail values are $25.00-$45.00 for a average Mint State coin.
Of all the Morgan dollars the 1921 coins are the highest mintage most common. Regardless of mintmarks, values for circulated coins are $16.00-$19.00.
Of all the Morgan dollars, the 1921 coins are the highest mintage most common. Regardless of mintmarks, values for circulated coins are $31.00-$40.00.
Retail values for a MS-60 to MS-63 are $20.00 to $31.00
The New Orleans Mint struck Morgans from 1879-1904. None were struck in 1878 & 1921
7-4-11>>> Of all the Morgan dollars the 1921 coins are the highest mintage most common. Values for circulated coins are $35.00-$41.00.
Not a Morgan dollar, last year was 1921. You have a 1923 Peace dollar that is very common and has values of $25.00-$27.00 in circulated condition.
A average Mint State 1921 Morgan is $30.00-$40.00
Two different One Dollar coins were issued in 1921. A Morgan dollar and a Peace dollar. In general the Peace dollars have higher values.