A typical (MS-63) Mint State 1880-O Morgan has a average retail value of $375.00 if certified by a known grading service.
From $75.00 to $180.00 in circulated condition
If it has any mintmark, it's on the back under the eagle and above the DO in dollar.
For U.S. silver dollars, the mintmark is located on the reverse of the coin under the eagle. For Morgan Dollars mintmark's are under the wreath and above the letters DO in DOLLAR. Peace Dollars have mintmark's under the word "ONE" near the eagle's tail.
That is the Mintmark.It is the S Mintmark.
1890 silver dollar is called a Morgan. There are several mints for these. It might have an S or an O near the bottom under the eagle. I would say it is worth at least 30 and more if the condition is better.
It's not really a silver dollar, but rather a U.S. Silver Eagle, which is a one ounce silver bullion coin. As of 18 July 2014, one is worth just under $21.
The coin is a Morgan dollar and assuming no little letters on the back of the coin under the eagle (S-O-CC) the value is $17.00-$26.00
A date is also needed, post new question.
On a 1926 Peace dollar the mintmark is above the eagles tail not below it. Look at it again and post new question.
If the coin has a mintmark it is under the eagle and above the letters DO in dollar on the reverse of the coin. But not all US coins have mintmarks, if it has none the coin was made in Philadelphia.
It's a PEACE dollar rather than a "peach" dollar, and should have the word PEACE on the back under the eagle. If it doesn't have the word and the eagle's wings are outstretched, you don't have a Peace dollar, you have the more common Morgan design. Please see the Related Questions for more information.
You have one troy ounce of 99.9% pure silver. Current value about $16. BUT I GUESS THIS IS NOT SILVER If the word PEACE is under the eagle, you have a standard-issue dollar coin made of 90% silver. Its value is around $16 depending on the price of silver.