Look on the back of the coin to see if there's a small mint mark letter below the eagle. It may be blank or there may be a D or S.
Numismedia lists the following approximate retail values as of 12/2011:
No mint mark (Philadelphia):
Very worn condition - $18
Moderately worn - $37
Slightly worn - $96
Almost no wear - $343
Uncirculated - $456 to $11,050 depending on quality
"D" mint mark (Denver):
Very worn - $18
Moderately worn - $38
Slightly worn - $101
Almost no wear - $349
Uncirculated - $480 to $6,440
"S" mint mark (San Francisco):
Very worn - $18
Moderately worn - $44
Slightly worn - $120
Almost no wear - $416
Uncirculated - $600 to $8,190
These coins are often called Barber halves after their designer, Charles Barber.
DISCLAIMER: The retail values quoted are the best available as of the date shown, but may vary significantly due to changes in the precious metals market. Also the wholesale (buying) price of a coin will be less than the selling (retail) price. A reputable coin dealer will be able to give a more accurate valuation based on inspection of the coin.
The US has never made a gold half dollar.
Please look at the coin again, No US one dollar coins were struck in 1912.
A US half dollar with a date of 1979 is a Kennedy half dollar not a liberty half dollar. The coin has no silver and is only face value.
Sorry, no US dollar coins dated 1912 exist, look at the coin again and post new question.
It has a metal value of about $10.
Value is for the silver about $2.50
a half dollar
The US didn't strike any half dollars in 1804.
A U.S. half dollar dated 1953 or 1952 is a Franklin half dollar. If it shows any wear, the value is only for the silver, about $10.00. The coins are very common.
A US half dollar with a date of 1983 is a Kennedy half dollar not a liberty half dollar.The coin has no silver and most are only face value.
The value of a US 1964 half dollar in circulated condition is around $10. in uncirculated condition they are worth around $16.
The Franklin half dollar was produced between 1948 and 1963. Please check your coin again. For the value of a 1937 LIBERTY half dollar, see the answer on WikiAnswers for the question "What is the value of a 1937 US half dollar?"
You have a Franklin half dollar - a 1957 proof coin is worth around $25.00.
A US Kennedy half dollar dated 1969 is only 40% silver with a value of about $2.00.
If the coin is a US Kennedy half dollar dated 1974 it has no silver in it and is face value.
The value of a 1966 Canadian silver half dollar is about 8.50 US dollars. In the case of the rare small bead variety, the value is between 1,000 and 2,000 US dollars.
The U.S. half dollar has never been made of gold. What you probably have is a gold-plated 1979 half-dollar. It's not really worth much above face value.
All US half dollars from 1964 to date have Kennedy on them, your 1995 half dollar is face value.
Look at the back of the coin for "HALF DOLLAR" no US dollar coins were struck after 1935.
The 1943 Walking Liberty half dollar is the high mintage of the series with an average value of $5.00 to $8.00 in circulated condition.
Please turn the coin over and check the denomination on the back. It's a half dollar, not a dollar. There's more information at the question "What is the value of a 1946 US half dollar?"