Primitive Chicken Country Store Advertising Display 1920s

One of my finds at a local church yard sale, I do not know when this was made. Even 2 appraisers from the pbs/antiques roadshow did not know. They saw these same photos. So my guess is 1915 to 1950s. She stood about 20" tall, and was made to come apart. I never could find out what this chicken advertised. Feed? Eggs? There was nothing written on it. Very interesting huge chicken.