1964 Kennedy Silver Half Dollar (Common Date):
- Circulated (Good-4 condition): $1-$2
- Uncirculated (MS-60): $4-$6
- Uncirculated (MS-65): $10-$12
- Uncirculated (MS-70): $25-$35
1964 Kennedy Silver Half Dollar (Proof Coins):
- Proof (PR-60): $15-$20
- Proof (PR-65): $25-$35
- Proof (PR-70): $150-$250
1964 Kennedy Silver Half Dollar (Special Varieties):
- 1964-D "Proof Like" Reverse: $10-$15
- 1964-D Silver Proof Reverse: $75-$100
Please note that these values are approximate and can vary based on market conditions, coin certification, and other factors. It's always best to consult with a coin dealer or numismatic expert for a more accurate assessment of a specific coin's value.