Assuming you mean a 1991 Silver Eagle, proof and uncirculated coins were struck that year. Proof coins were struck at the San Francisco Mint and carry the "S" mintmark, mintage was 511,925 and have a current retail value of $18.00
Uncirculated coins were struck at the Philadelphia Mint, carry no mintmark and mintage was 7,191,066 with current retail value of $17.00
It's worth any where from $75-$100 sealed in mint condition.
$20
The value of a 1991 .999 silver dollar Liberty coin with no mint mark depends on its condition and the current market demand for silver. As of now, the silver content alone would make it worth around the melt value of silver. However, if the coin is in excellent condition and highly sought after by collectors, it could be worth more. It's recommended to consult with a professional coin dealer or appraiser for an accurate assessment.
$987
Average current market value for the 1991 PF Koren War Memorial silver dollar is $17.00-$23.00 depending on the actual grade of the coin.
50¢. It's an ordinary circulation coin, and it's called a Kennedy half dollar. ALL U.S. coins bear the word "Liberty" and many older ones have a picture of Miss Liberty as well.
50 cents, it is not silver and was a coin intended for circulation.
It's a bullion coin sold for its silver content. Check your local newspaper or a financial website for the "spot price" of one ounce. During 2008 the price has bounced around between $13 and $18/oz.
6-4-11>>> If you mean a 1991-S proof Silver Eagle bullion coin? The average current value is $43.00.
A 1999 1oz silver dollar may be worth up to $50. The value is based on the value of silver at the time of sale. The price of silver changes nearly by the minute.
If it doesn't contain any Silver at all, the market price is set by the mintage number for 1991 one dollar coins + condition of the coin.
This stuff has no numismatic value at all, but check eBay for values