1964 Kennedy Half Dollar value is current melt for circulated examples, and uncirculated examples can bring $8-$10 raw.
1964 Kennedy halves can be worth $30 if graded and MS65 and as much as $500 is graded MS67 by PCGS or NGC.
It is the only Kennedy Half made of 90% silver and was also included in the proof set and rare SMS or Special Mint Sets. Struck at Philadelphia Mint so no mint mark is present.

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Kennedy Half Dollar Photo Grade

Specifications: 90% Silver Planchets (1964 Only)
Designer: Obverse by Gilroy Roberts; reverse by Frank Gasparro
Diameter: 31 millimeters
Metal content: Silver – 90% Copper – 10%
Weight: 193 grains (12.5 grams)
Edge: ReededMint mark: None (for Philadelphia, PA) left of the stem of the olive branch on the reverse