As of 11/25/2011, about $32.
The value of a troy ounce coin of 999 fine silver is based on the current spot price of silver in the market. You can calculate its worth by multiplying the weight of the coin in troy ounces by the current spot price of silver. Additionally, consider any premiums or fees that may apply when buying or selling the coin.
There is a real Bill of Rights coin but it is a commemorative coin minted in 1993. Since yours has a 1991 date and "one troy ounce .999 fine silver" on it, I think you probably have a bullion coin and it is worth whatever the silver in it is worth on any given day.
Silver currently sells for about $16/oz.
Silver is currently valued at about $13.50 per ounce. A dealer will buy single ounce bars or rounds for about $10 or sell them for about $16.
512.00 is the spot price on the current market for 1 pound troy ounce fine silver morgan dollar proff dated 1878 but my advice is find a coin dealer or even better a private coin collector and your coin would be worth closer to 750.00
Silver is trading at about 28.50 an ounce. A half ounce of silver is worth about 14.25.
Silver is currently selling for about $17 an ounce. A dealer would sell this coin for about 10-15% over spot price or buy it about 10-15% below spot.
If it's a 999-fine silver bullion, it would be worth approximately the spot price of silver or around $13.
As of 10-21-11 silver is $31.40 per ounce. If the piece is .999 Fine silver the value is about $500.00.
August 19, 2009 It is worth $14.00 today.
It's a silver round not a "coin" value is whatever the spot price of silver is at time of sale.
The U.S. did not make any dollar coins dated 1816. From your description, it's a silver round not a genuine coin. Value is about $19.00.
....Its a 1 ounce bullion coin/round. These are privately minted rounds produced as an easy way to invest in silver. They are usually not dated because they are not numismatic products and aren't collected as a coin is. Rather they are just worth their intrinsic silver value. Today they are worth about $30, but it depends on silver spot price.