It would be an extraordinary coin because the so-called "Mercury" design was only used on dimes minted from 1916 to 1945.
What you have is almost certainly a Morgan dollar. Please see the Related Question.
Currently a 1880 S Morgan silver dollar in MS65 uncirculated condition is worth $156.
If you mean a 1880 Carson City Morgan dollar? circulated examples run from $100.00-$300.00
A 1880-S Morgan Silver Dollar that is in a mint state of MS67 is worth: $ 450.00.
1880-series US $2 bills were issued as United States Notes rather than silver certificates. Please see the question "What is the value of an 1880 US 2 dollar bill?" for more information.
Currently as of April 2012 a 1880 Morgan silver dollar in MS63 uncirculated condition is worth around 63 dollars.
Currently a 1880 S Morgan silver dollar in MS65 uncirculated condition is worth $156.
Please see
If you mean a 1880 Carson City Morgan dollar? circulated examples run from $100.00-$300.00
A 1880-S Morgan Silver Dollar that is in a mint state of MS67 is worth: $ 450.00.
1880-series US $2 bills were issued as United States Notes rather than silver certificates. Please see the question "What is the value of an 1880 US 2 dollar bill?" for more information.
August 29, 2009 The more common 1880-CC dollar in MS65 grade has a value of $1625. The less common Proof-like 1880-CC dollar in MS65 grade has a value of $1900. The scarce Deep Mirror Proof-like {DMPL} 1880-CC dollar in MS65 grade has a value of $11,000.
Currently as of April 2012 a 1880 Morgan silver dollar in MS63 uncirculated condition is worth around 63 dollars.
In MS60 Grade uncirculated, a 1880 S Morgan Silver Dollar is worth about $52. In MS65 Brilliant Uncirculated, it is worth over $330.
See the related link below for a picture of the 1880 silver dollar.
Responses to questions on Answers.com are normally specific to one item. Please check for questions "What is the value of an 18xx US silver dollar?", where 18xx is 1880, 1881, etc.
"DO" isn't a mint mark. The mint mark on a silver dollar for that year is on the reverse (tails) side, just above the letters "do" in the word "dollar."
A silver dollar with the national motto E PLURIBUS UNUM on it dated 1880 is actually called a MORGAN dollar, most all US coins have this motto somewhere on the coin. It's a very commoncoin with a retail value of $36.00-$42.00