26.73 grams.
They weigh 26.73 grams without any ware. If it is worn it may be slightly lower.
The 1883 Morgan is a very common coin. It is not considered rare or even scarce.
The mint mark on any Morgan dollar is on the reverse above the letters DO in dollar.
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.
The 1883 Morgan dollar is common with retail values for circulated coins at $18.00-$30.00 and uncirculated coins at $40.00-$60.00
The O is the mint mark, it stands for the New Orleans mint.
About $17 or $18, or more if silver rises dramatically in price (as of January 30, 2008, silver is $16.76 per troy ounce and the Morgan silver dollar has an Actual Silver Weight of 0.7734 troy ounces, giving it a "melt value" of about $12.96). Note that there would be no "P" mint mark - coins produced in Philadelphia at that time had no mint mark.
This stuff has no numismatic collectible value. As for the value, try eBay. For some reason they do sell a lot of Morgan dollar copy's.
With a date of 1883 the coin is not a silver eagle it's a Morgan dollar and is very common in mint state condition. Retail values are $28.00-$50.00 depending on grade.
For this year the mintmarks can only be "S" "O" and "CC" or no mintmarks. No Morgan dollar will have a "P" mintmark like modern coins.
1883 Morgan dollars are very common. Coins in the AU (about uncirculated) grade range have values of $22.00-$26.00
The value of a 1883 uncirculated cc silver dollar is $200.00 or more but,not over than $250.00