It is one of the "Art Deco" series made from 1942 thru 1947-1/2. Looks to be at least a 1.5, possibly 2 ton. They all remained unchanged during WWII until the "AD" (Advanced Design) series were introduced in 1947-1/2.
The axles and fenders are slightly different between the 1.5 & 2T. Everything else is pretty much the same on that series.
PS...the fact that this series remained unchanged all during the "war years" means there are more parts available than one might think.