There many places where one can find information on US coin values. One can find this information from online websites such as Coin Study. One may also be able to get an idea on US coin values by viewing US coins on eBay.
US$47
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sammler.com, a major German collectibles site, lists the following approximate retail values as of 04/2010. The coin was struck in a .625 silver alloy so the values for a circulated coin are based on its silver content, regardless of mint mark. Slightly worn - US$11.70 Almost no wear - US$27.60 Uncirculated - US$690
Assuming the coin is circulated and has no mintmark, the 1883 Morgan dollar is a very common coin with retail values of $31.00-$39.00 depending on the grade of the coin.
$1,320.00-$1,520.00 are the current retail values for this coin in circulated condition.
Assuming the coin is circulated and no mint mark retail values are $312.00-$420.00
Assuming the coin is circulated and has no mintmark, the 1883 Morgan dollar is a very common coin with retail values of $32.00-$39.00 depending on the grade of the coin.
The coin needs to be seen for an accurate assessment, but most have retail values of $80.00-$135.00 depending on the grade of the coin.
Assuming the coin is circulated and has no mintmark, the 1879 Morgan dollar is a very common coin with retail values of $32.00-$40.00 depending on the grade of the coin.
Assuming the coin is circulated and has no mintmark's, retail values are $29.00-$40.00 depending on the actual grade of the coin. The 1883 Morgan dollar is a very common coin.
Take it to a coin show or dealer, this year has 4 kinds of coins an very range of values.