Please check your coin again. The Denver mint did not open until 1906. The only mint marks will be blank (Philadelphia), S = San Francisco, O = New Orleans, CC = Carson City.
The Denver Mint didn't begin production until 1906, and the Dahlonega Mint closed in 1861. On an 1881 silver dollar, it's probably an O for New Orleans, not a D.
Yes it is 90% silver and 10% copper.
According to NumisMedia a 1881 US silver dollar in MS-64 uncirculated condition is worth: $144.
According to NumisMedia a 1881 US silver dollar in MS-64 uncirculated condition is worth: $85.
You can go to Google images (images.Google.com) and search for: 1881 Morgan
About $150.
it all depends as it can be worth a lot but you will need to post a more specific question. an 1881 silver dollar is a Morgan dollar named after the man that designed it. it is 90% silver and 10% copper. the coin weighs nearly an ounce so it is at least worth 80% the price of silver. here is a link to a website that I use all the time for help on coins it is an exact link to the Morgan dollars http://www.golddealer.com/morgan.html
The 1881-S Morgan is very common, circulated coins are $17.00-$26.00.
1881 is a common date Morgan dollar, retail values for circulated examples are $17.00-$26.00 depending on grade.
1881 is a common date Morgan dollar, retail values for circulated examples are $17.00-$26.00 depending on grade
The silver dollars retail value in extra fine condition on a 1881-CC is $200.00.
The mint mark position on all Morgan dollars is above the DO in DOLLAR. No mint mark = Philadelphia S = San Francisco O = New Orleans CC = Carson City D = Denver (1921 only)