What is the value of an 1928 silver dollars without a mint mark?

Assuming the coin is circulated, the 1928 Peace dollar is the key-date coin of the series. For an accurate assessment of value the coin needs to be seen and graded. Most coins show very heavy wear. In general retail values for low grade coins are $275.00-$300.00, better grade are $310.00-$335.00 and coins showing almost no wear run from $350.00-$445.00. Values are a market average and only for coins in collectible condition, coins that are bent, corroded, scratched, used as jewelery or have been cleaned have far less value if any to a collector or dealer.