The U.S. Mint has never produced a one troy ounce seated liberty coin.
I can only deduce that you have a privately minted one ounce silver round that has a seated liberty design on it. These have been minted for decades and continue to be minted every year by private companies.
It sounds like what you have is a privately minted bullion coin that is meant to look like a US Seated Liberty dollar from the mid 1800's. If it is in fact silver, it is likely worth no more than the metal value of the coin (silver is trading at US$35.30 per troy ounce as of midday on March 4, 2011). If it is not actually silver, it probably has very little value.
It's not a coin, it's a bullion piece or "round". Its value is tied to the spot price of silver, currently about $12-$13 per ounce.
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.
From your description this is not a US Mint product, it's a privately minted replica of the 2001 American Buffalo silver dollar, the value is for the silver only, about $26.00.
The $50 Liberty is a bullion coin valued for the one troy ounce of gold it contains. Current price would be $1200 - $1400, depending on the spot gold market.
The amount of pure gold in the coin does not equal an ounce, the Actual Gold Weight (AGW) is .48375oz. The total weight of the coin is 16.718grams.
Yes, if it has the word "COPY" on it, it is a fake coin.
1945 Est. 140,000 minted Value: Bullion Value +20% contains 0.0482 Troy oz. of gold
What you have isn't a US coin, but rather a privately minted silver bullion round. It is worth whatever 1 troy ounce of silver is worth, at the time of writing it is worth about $34, but the price of silver fluctuates, sometimes wildly, so tomorrow it will be worth more or less.
It is worth whatever one troy pound of silver is worth. Since 1 troy pound is 12 troy ounces and since one troy ounce of silver is worth ~$22, your coin is worth $264. However, keep in mind that silver prices fluctuate on a minute by minute basis.
Actually it's Liberty walking not standing. It's one (Troy) ounce of silver with a current values of $34.86.
It depends on the condition and the mint mark.The 1920 Standing Liberty Half Dollar minted in Philadelphia (no mint mark) is worth between $7.00 in "Good" condition (note that "Good" is a numismatic term of art meaning "not very good at all") to $75.00 in "Extremely Fine" condition (and $350.00 in "Uncirculated").The 1920 Standing Liberty Half Dollar minted in Denver ("D" mint mark) is worth between $12.00 in "Good" condition to $475.00 in "Extremely Fine" condition (and $1,550.00 in "Uncirculated").The 1920 Standing Liberty Half Dollar minted in San Francisco ("S" mint mark) is worth between $7.00 in "Good" condition to $235.00 in "Extremely Fine" condition (and $850.00 in "Uncirculated").The coin is 90% silver, has 0.3617 troy oz ASW ("Actual Silver Weight") and thus has a "melt value" (at the 11/29/07 troy ounce price of silver of $14.30) of about $5.17.The coin is a WALKING LIBERTY half dollar, the standing liberty series are Quarters.