What is the value of an 1880 silver dollar with no mint mark?

8-23-11>>> Assuming the coin is circulated, the 1880 Morgan Dollar (1878-1904 & 1921) is a common coin. Most coins have seen heavy use and show a lot of wear. Retail values are $37.00-$41.00 depending on what grade the coin is. Values are only for coins in collectible condition, coins that are bent, corroded, scratched, used as jewelry or have been cleaned have far less value if any to a collector or dealer.