This has a half cab Cab Enclosure. My assumption is that this was custom cut down into a half cab. I suspect the Cab’s part number can definitively document whether the cab is originally a full cab or not.
https://www.facebook.com/marketplace/item/2350744298471166/
“Runs Drives Plows really well Body isn’t perfect Fhead Original trans and tcase Good oil pressure Clean title Military m38 half cab”