1904 is a relatively common date for Morgan dollars
Look on the back of the coin to see if there's a small mint mark letter above the DO in DOLLAR. It may be blank or there may be an O or S.
Numismedia lists the following approximate retail values as of 01/2011:
No mint mark (Philadelphia):
Very worn condition - $28
Moderately worn - $30
Slightly worn - $31
Almost no wear - $39
Uncirculated - $76 to $10,210 depending on quality
"O" mint mark (New Orleans):
Very worn - $26
Moderately worn - $28
Slightly worn - $29
Almost no wear - $30
Uncirculated - $37 to $3,910
"S" mint mark (San Francisco):
Very worn - $25
Moderately worn - $44
Slightly worn - $81
Almost no wear - $608
Uncirculated - $1,200 to $46,880
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.
It's not a dollar, no dollar US coins were issued in 1906 the last year was 1904. The coin is likely a 1906 Barber Half dollar and if it has so much wear you can't read the words HALF DOLLAR on the reverse the value is just for the silver in the coin, about $6.00
No US silver dollars were minted in 1919. Production of silver dollars was suspended at the end of 1904 and not resumed until 1921. If your coin has a picture of Miss Liberty and a sun on the front, please turn it over and check the back. It's a half dollar, not a silver dollar. There's more at the Related Question.
Please check your coin again. It's either not a dollar, not a Morgan-design dollar, or not from 1823. Morgan dollars were minted from 1878 to 1904 and in 1921. No US silver dollars were made for circulation from 1804 to 1835 inclusive.
what is the current value of an 1878 silver dollar
A 1922 dollar with the word "Peace" on the back would be a Peace dollar rather than a Morgan dollar. "Morgan" refers to George T. Morgan, the artist who designed the silver dollars minted from 1878 to 1904 and in 1921. There's more information at the question "What is the value of a 1922 US silver dollar?"
200 Thousand Or More
It's not a dollar, no dollar US coins were issued in 1906 the last year was 1904. The coin is likely a 1906 Barber Half dollar and if it has so much wear you can't read the words HALF DOLLAR on the reverse the value is just for the silver in the coin, about $6.00
A real silver dollar has a $25.00 value just for the silver.
No US silver dollars were minted in 1919. Production of silver dollars was suspended at the end of 1904 and not resumed until 1921. If your coin has a picture of Miss Liberty and a sun on the front, please turn it over and check the back. It's a half dollar, not a silver dollar. There's more at the Related Question.
The coin is 90% silver & 10% copper.
what is the current value of an 1878 silver dollar
Please check your coin again. It's either not a dollar, not a Morgan-design dollar, or not from 1823. Morgan dollars were minted from 1878 to 1904 and in 1921. No US silver dollars were made for circulation from 1804 to 1835 inclusive.
A 1922 dollar with the word "Peace" on the back would be a Peace dollar rather than a Morgan dollar. "Morgan" refers to George T. Morgan, the artist who designed the silver dollars minted from 1878 to 1904 and in 1921. There's more information at the question "What is the value of a 1922 US silver dollar?"
Sorry no US silver dollar coins dated 1826
No US silver dollars were made after 1935, look at the back of the coin for 'Half Dollar'.
The US never printed 100 dollar silver certificates with this date.
current silver troy ounce value