Circulated coins have retail values of $312.00-$414.00. The 1880 Liberty Head Half Eagle is a common coin.
Your coin is called a Morgan dollar. "American Eagle" coins are modern bullion pieces made since 1986 for collectors and investors; Morgan, Peace, and other standard-issue silver dollars were made for use in ordinary commerce. They were discontinued in 1935. Please see the question "What is the value of an 1880 US silver dollar?" for more information.
$27 to $70,000 depending upon the mint mark, the variety and the condition of the coin.
Yes.
A typical (MS-63) Mint State 1880-O Morgan has a average retail value of $375.00 if certified by a known grading service.
about 50 bucks, nowadays.
$1500
A 1880-S Morgan Silver Dollar that is in a mint state of MS67 is worth: $ 450.00.
The mintmark (if it has one) is on the reverse under the eagle.
In MS60 Grade uncirculated, a 1880 S Morgan Silver Dollar is worth about $52. In MS65 Brilliant Uncirculated, it is worth over $330.
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.