Morgan dollars are silver, not gold.
If the coin is a real Morgan or Peace dollar. The value is just for the silver, about $20.00.
Current retail value for a Liberty Head 1903 Double Eagle is $1,490.00 in the grade of MS-60
You possess a Coronet Head $20 Double eagle gold coin - if this coin was minted in 1903 and is in very fine condition (VF20), its value is: $1200.
Current retail price is $312.00-$420.00 for circulated coins depending on grade.
Assuming you mean a Morgan silver dollar and not a gold one dollar coin, if the coin is circulated and has no mintmarks, retail value is $26.00-$32.00 depending on how much wear the coin has. The 1883 Morgan is a common date.
If the coin is a real Morgan or Peace dollar. The value is just for the silver, about $20.00.
Current retail value for a Liberty Head 1903 Double Eagle is $1,490.00 in the grade of MS-60
The Morgan Dollar is not gold. Since this is the most common date of all the Morgan Dollars, unless it is uncirculated it is worth only a little more than the value of the silver it contains (currently about $12). If it has been gold plated, a collector will only pay the silver value. try this site its useful http://gold-price-blog.info/
Likely it has been reduced to just the bullion value of the coin, but that's about $800.00 as of today.
You possess a Coronet Head $20 Double eagle gold coin - if this coin was minted in 1903 and is in very fine condition (VF20), its value is: $1200.
In circulated grades both coins have the same values of $312.00-$414.00 depending on grade. In uncirculated grades the 1900 is $444.00 & the 1903-S is $504.00
Current retail value would be $680.00-$720.00 depending on who give the coin that grade.
Current retail price is $312.00-$420.00 for circulated coins depending on grade.
Assuming you mean a Morgan silver dollar and not a gold one dollar coin, if the coin is circulated and has no mintmarks, retail value is $26.00-$32.00 depending on how much wear the coin has. The 1883 Morgan is a common date.
Any plated coins are only worth their melt value. Fortunately, as of early 2010 that comes to about $14 retail, or about $10 wholesale, for a 1921 Morgan dollar.
== == There is NO gold in a Morgan dollar. They are all large coins, 38.1 mm in diameter, and made of 90% silver and 10% copper as were all silver coins up till 1964. If the coin you have in question is truly an 1890 gold dollar it will be smaller than a dime and the specie weight value will be around $50.00. The coin must be seen to be properly appraised. As noted above the Morgan Dollar is a Silver Coin and not a gold piece.
Regardless of mint mark, retail values are in the $200 to $250 range depending on condition and the current price of gold.