For the Morgan dollars, 1921 was the last year of issue and the highest mintage. They were struck at all 3 Mints. Current retail value of a 1921-S is $30.00-$40.00 for circulated examples depending on the grade. Uncirculated are $45.00-$55.00 for most coins.
This coin appraises for between 90.00 and 150.00, depending on condition.
1883-S $30 to $250,000, 1880-O $27 to $70,000, 1921-O does not exist.
The Morgan dollar is named for its designer, George T. Morgan. They were minted from 1878 through 1904, then again for one year in 1921. As always, the value of a coin depends on its condition, its rarity, and sometimes its bullion value. The Morgan dollar contains .77344 oz of pure silver, and the value of silver changes from day to day. However, to a collector, the value of the silver content does not affect a coin's value as a collectors item. I looked online to see what 1921-S Morgans are selling for and they range from $50 in Fine condition to $60 in about Uncirculated.
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
The last Morgan dollars were dated 1921. Your coin would be a PEACE dollar. Please see the Related Question for details.
7-28-11>>> Of all the Morgan dollars, the 1921 dated coins are the highest mintage most common. Regardless of mintmarks, values for circulated coins are $36.00-$44.00.
That is the Mintmark.It is the S Mintmark.
Value is $17.00-$26.00
Sorry no O mint in 1921,it's a D or S. The 1921 date is so common even in mint state the buy value is below $40.00.
One dollar.
Circulated coins are valued at $14.00-$19.00
The is no 1921S Peace dollar; Peace dollars were not produced in San Francisco ("S" mintmark) in 1921. If your 1921 dollar coin is a Peace dollar, it was produced in Philadelphia and has no mintmark; if it has an "S" mintmark, it is a Morgan dollar produced in San Francisco).