MD4Fred -- I just upload a photo of my firewall
here I'm not sure what it says, but Mr. Dady said it was there the day he bought the truck new in the early fall of 1949 at Dickson Chevrolet in Dickson, TN.
What is interesting is that the truck was built in August at the Norwood, OH plant. I would be very interested to see if there are any other original Norwood '49's with this same marking. My '49 4400 is also a Norwood truck but that part of the firewall was pretty grime covered before I took it apart and had it cleaned/repainted.
This is an interesting topic and it would be great if someone wanted to take it on as a research project.
Regards,
John