1. Common-Date Kennedy Half Dollars: Half dollars from these years that are in circulated condition and do not have any special mint marks are generally worth face value (50 cents).
2. Uncirculated Kennedy Half Dollars: Well-preserved uncirculated Kennedy half dollars from 1964 to 1969 can be worth a slight premium over face value, around $1 to $2.
3. Special Mint Marks: Kennedy half dollars minted in specific mints during these years may have special mint marks, which can increase their value. For instance:
- 1964-D Kennedy half dollar (Denver mint) - $1 - $2
- 1968-S Kennedy half dollar (San Francisco mint) - $2 - $3
4. Error Coins: Kennedy half dollars with errors, such as doubled dies or other minting irregularities, can be highly valuable and sought after by collectors. Their values can range from a few hundred dollars to thousands of dollars depending on the rarity and severity of the error.
5. Proof Coins: Kennedy half dollars minted as proof coins have a special finish and are produced in limited quantities. Proof coins from 1964 to 1969 can be worth anywhere from $10 to several hundred dollars.
It's important to note that the values mentioned above are approximate and can vary based on market conditions and the specific condition of the coins. Consulting a reputable coin dealer or referring to up-to-date price guides is advisable to obtain accurate values for your Kennedy half dollars.