The U.S. has never used a G mint mark. It's possible you're seeing a somewhat blobby "S", from San Francisco.
As of 06/2008 retail prices for Barber halves are roughly:
No mint mark, D, or O : $12 in worn condition, $32 with moderate wear, $85 with slight wear.
With an S mint mark : $17 / $65 / $140
half a dollar
A 1969-S proof half dollar - aka - Kennedy Half Dollar is worth: $7.00.
Value runs from $185.00 to $250.00 in circulated condition.
Kennedy is on the HALF dollar. A 1994 half is worth 50 cents.
It depends on the year and condition, but it's worth at least half a dollar.
a half hundred dollar bill is worth $50
A half dollar.
HALF a dollar - $0.50
If you mean a 1998 Kennedy half dollar, the coin has no silver in it and is worth face value.
The 1966 Kennedy half dollar is 40% silver and worth about $5.00.
About one dollar.
Eisenhower was on the one dollar coin, not the half, and they're worth one dollar.