Possible 1930's coca cola cooler

I bought this cooler a few weeks ago and I believe its from the 1930's. I have a picture of the marking in the water tank that I think is the manufacture date, CC-50-5. Anyone know about identifying these things or a website that I can find out for free? I don't have a full pic of the cooler as it is torn apart right now for restoration. Of these pictures the first one is the number I described, the second and third are of the top of the lid and the fourth is the inside of the lid. I appreciate any help, thank you!