Need a little help with this one. I rescued it from lying in the former owners backyard several years ago. The owner said it came from his wife's uncle, who owned a station in NJ. In the bottom right red pen stripped border is stamped Ingram-Richardson, Beaver Falls, PA. Measures 14" Wide x 50" long, Single sided porcelain. Looking for age and approximate value, and Thanks.

1920's aprox $700

Picture isn't clear enough to tell condition but I see that sign at a show easily being $1500.
Pat