Most silver dollars are worth 15-20 dollars. Certain rare mint marks can increase the value. And, of course, condition is very important.
Retail values for a circulated 1899 Philadelphia issue Morgan are $105.00-$250.00 depending on grade.
1899 would make it a Morgan dollar. The mint mark is located on the reverse (tails) side, near the bottom, just above the letters "do" in the word "dollar."
The 1899 Morgan dollar is a better date of the series, a coin with average wear has a retail value of $100.00 to $150.00, better coins are $175.00 to $250.00
1893 was the last year Morgan dollars were issued from the Carson-City Mint.
All U.S. Silver Dollars since 1878 have this Latin phrase that is a national motto. It is not a type of coin. 1899 is a better date for the MORGAN dollar series. Values for average circulated coins are $80.00-$125.00.
With all Morgan Silver Dollars, the mint mark is located on the reverse side underneath the wreath which is below the Eagle's arrows.
There were no series letters on 1899 $2 silver certificates. Please see the question "What is the value of an 1899 US 2 dollar silver certificate" for values and other information.
The Denver Mint did not begin operations until 1906 so the mintmark you see is likely an "O" for New Orleans. The 1899-O Morgan is a common date/mint coin, retail values are $17.00-$26.00 for circulated examples.
Mintmarks are on the reverse above the letters DO in dollar
The US did not print any two dollar silver certificates after 1899.
Someone said about $20, a silver dollar with 90% silver is around 0.77 ounce. the value of the silver alone is $35. So not sure why the person answered that its only 17-20. I have the same coin. I think from researching my own coin is worth about $40-$45
1899-O Liberty Silver Dollar: good condition-$11.00, mint condition-$180.00