1921-S: The 1921-S Walking Liberty half dollar is the most valuable, with an estimated value of $16,300 to $31,870.
1919-S: The 1919-S Walking Liberty half dollar is also highly valuable, with an estimated value of $3,700 to $9,800.
1921-D: The 1921-D Walking Liberty half dollar is valued at $6,200 to $15,900.