1948 is the date on the photograph.
Could it be a new tractor? Could he be showing it off? Something about this picture interested me because you see a lot of guys and gals beside their automobiles but not many beside or on their tractors. Perhaps some of you will know what kind of tractor it was. The back of the card says THE FOX COMPANY, SAN ANTONIO, TEX. JULY 1948.
Scanning the old photographs seems to enlarge them so the detail is clearer and someone may be able to say what he was doing. Probably we will never know who the driver was and that is sad.