There was a really good "chain" in the 1960s southeast US called Davis House (or Davis Brothers). It was a more upscale version of a restaurant that served mainly Kentucky Fried Chicken, although there was many other dishes.

"The restaurant was originally named Johnny Reb's Chick-Chuck-'N'-Shake, and was sold in 1966 to A. T. Davis, Tubby's brother, who became a franchisee of Col. Harlan Sanders' Kentucky Fried Chicken."

http://www.highwayhost.org/DavisBros/davisbros1.htm

https://mistercola.com/products/vintage-placemat-davis-broth...