1974-D DDO Kennedy Half Dollar Value FS-101 is $15 to $20 in circulated condition, and uncirculated examples can bring $30 to $140 raw.
1974-D DDO Kennedy Half Dollar FS-101 can be worth $120 in MS65 and $1,200 in MS66, if graded by PCGS or NGC. Look for the Doubled Die Obverse
These are not silver but copper nickel and clad and they where minted with D (Denver Mint) mint mark or without a mint mark (Philadelphia Mint) for 1971-1979.
Copper-Nickel Clad Coinage (1971-Date)
Designer: Obverse by Gilroy Roberts; reverse by Frank Gasparro
Diameter: 31 millimeters
Metal content: Outer layers – 75% Copper, 25% Nickel
Center – 100% Copper
Weight: 175 grains (11.3 grams)
Mint mark: “S” (Denver Mint) and centered above the date. It is normal for 1971 through 1979 to be without a mint mark.