What is the value of an Alabama centennial half dollar?

If the coin is in uncirculated condition or better. The value would be $330 to $2,000 USD, provided it is the variety known as 2X2. Now, if it is just a regular 1921 Alabama Centennial . In uncirculated condition it is worth $215 to $1,800. See Krause KM #148.1 and #148.2. (2/28/2010)