1: "1904-O" - The 1904-O half dollar is a key date with only 3,720,000 minted.

2: "1916-S" - The 1916-S Walking Liberty half dollar is rare and highly sought after.

3: "1921" - The 1921 half dollar is the only year the coin was struck in high relief.

4: "1938-D" - The 1938-D Walking Liberty half dollar is a rare Denver Mint issue.

5: "1946-S" - The 1946-S Booker T. Washington half dollar is a scarce coin.

6: "1955" - The 1955 Franklin half dollar is a key date with a low mintage.

7: "1964-D" - The 1964-D Kennedy half dollar is the last 90% silver issue.

8: "1970-D" - The 1970-D Kennedy half dollar is a key date for collectors.

9: "1976" - The 1976 Kennedy half dollar is a bicentennial issue with an interesting design.