Below is a photograph of the original sign taken in February 1941. Also included are a postcard featuring the sign with Terminal Station in the background. The final photo shows the new sign at the Rotary Trail.
As with so many things related to Birmingham, a fascinating history of the original sign can be found at the wonderful BhamWiki site.
Source: Birmingham Public Library Digital Collections
Source: BhamWiki
Source: WBHM-FM