If you mean a replica of a 1933 $20 gold coin? it's only worth what you can get.
All 1933 Walking Liberty halves were struck at the San Francisco Mint. Average circulated coins (below EF-40 grade) are valued at $18.00-$20.00. The better grade coins are $50.00 to more than $300.00. I suggest having the coin graded for a accurate value.
The only US halves dated 1933 are Walking Liberty, not liberty head. They were all struck at the San Francisco Mint and in average condition are $20.00
These copy's of the 1933 Double Eagle have no numismatic collectible value, most sell for $5.00 at coin shows.
Franklin halves were minted from 1948 to 1963. Halves minted from 1916 to 1947 carry a picture of Miss Liberty and are called Walking Liberty halves. Please check your coin again and post a new question.
A copy of any US coin has no numismatic value. Its principal worth is the value of the metals used to produce it plus whatever you are willing to pay for it.
It's gold plated, but not gold. The good news is that 1942 is a common date for Walking Liberty halves so you can still sell it for its melt value of $5-7 as of 07/2010. In any case, a gold half dollar would have been about the diameter of a pencil eraser, and no gold coins were made for circulation after the US went off the gold standard in 1933.
The only real one is more than 7 million dollars, a replica is about 5 dollars
These copy's of the 1933 Double Eagle have no numismatic collectible value, most sell for $5.00 or less at coin shows.
Walking the Baby - 1933 was released on: USA: 12 May 1933
Only 4 denominations were struck in 1933, the Lincoln cent a Walking Liberty Half dollar a Indian Head $10.00 gold eagle and the $20.00 Saint-Gaudens double eagle
The word LIBERTY only tells us that the coin is from the United States. Please post a new, separate question with the coin's denomination.
In 1933 the cost was less than $20.00, manufacturing the coin had to be less than face value. But if you mean a replica, likely less than a dollar.