What is the value of a 1942 Liberty Half Dollar?
All Walking Liberty Half dollars from 1940 to 1945 regardless of mintmarks, in average circulated condition are valued the same. About $12.00 as of 3-11-11
The values will go up and down along with the price of silver.
Your coin is called a Walking Liberty half dollar and was minted for use in ordinary commerce. "American eagles" are large bullion coins minted since 1986 and sold to collectors and investors. They have an artificial denomination of $1 but aren't intended for spending. There's more information at the question "What is the value of a 1942 US half dollar?"
Walking Liberty Half Dollars will never have a "W" mintmark. Instead, that is the designer's signature. If your Walking Liberty Half Dollar has a mintmark, it will be on the left side of the coin near the branch that the Eagle is perched upon. 1942 was a common year of Walking Liberty half dollars and they are worth about $12.75 for their silver content, unless the coin is in mint state, in which case the…
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.