There were many professional sign painters available during the depression. The word here is "cheap" owners of business's painted there own signs. Many customers would shy away from "do it yourself signs", on public business's, as it show the owners cheap. Many cities have standards for the quality of ones signs. In many cases, this one would be condemned and ordered to be improved. It takes years of practice to master the art of hand lettering. Unfortunately, like a lot of trades, the average person thinks they know it all.
The building looks great. You have improved within the last few postings. Go back and look at some of your first buildings.
Another tip: Make 4-5 layouts of the sign on the building, pick out the best, and use it. Better yet, look at other professional signs in your area for ideas.
Keep up the great work.
