Assuming the coin is circulated and still in collectible condition, the 1889 Morgan dollar is a high mintage common date coin. Average retail values as of 8-30-11 are $38.00-$44.00 depending on the grade of the coin.
The value of 1889 Morgan silver dollar replica ranges from $23.01 to $26.76
The most common Mint State grade for an 1889 Morgan dollar is MS-63 and retail value is $53.00
The mint mark (if it has one) on all Morgan silver dollars is on the reverse of the coin just above the letters "DO" in dollar.
The mint mark on a Morgan dollar (if any) will be found on the reverse of the coin under the wreath between the "D" and "O" in "DOLLAR".
The mint mark (if it has one) on all Morgan (1878-1904 & 1921) silver dollars is on the reverse of the coin, just above the letters "DO" in dollar.
The mint mark on all Morgan silver dollars is located on the reverse side of the coin just above the letters "DO" in the word "DOLLAR".
$27 to $350,000 depending upon the mint mark and the condition of the coin.
If your coin actually is a Mint State 1889 Morgan dollar, typical MS coins are $50.00-$75.00 depending on grade.
On Morgan dollars (the type minted at the time), the mint mark is on the back, towards the bottom, just above the letters "do" in the word "dollar." And if there's no mint mark, it means it was minted in Philadelphia.
The mint mark on any Morgan dollar is on the reverse above the letters DO in dollar.
The San Francisco Mint
Not always, no. If it was minted in Philadelphia, then there is no mint mark.