seriously...50 cents... Correction. 1964 (90% silver) - about $6 as of 06/2009 1965-69 (40% silver) - about $2.50 as of 06/2009 1971-present (copper-nickel) - no added value.
It's just 50 cents, spend it.
Being gold plated removes its numismatic value. The coin is worth 50 cents and the plating less than one cent.
When Joe Kennedy died in 1969 his estate was worth an estimated 400 million dollars.
There's no such coin. Please turn the coin over and look at the denomination on the back. JFK is on the half dollar.