The model number is NAA
It was manufactured in 1953
I have a lot of information on the Ford, collected when I was head of the grounds committee.
Also, many years ago, I made a detailed, enclosed in a plastic folder, that was originally hung on the wall next to the Ford. It included color photos with arrows pointing to where every thing was, and how to maintain the tractor.
I understand it disappeared a long time ago. Possibly in the office.