However, the front axle is a Chevrolet-style banjo-type and not a Ford split-type. It must therefore have been an early FGT with Chevrolet (McKinnon) front axle unless it was a service replacement? I find it difficult to imagine that any FGTs were still in service by then, and query whether it was a derelict-find? It would have had to be a #12 cab if it was an original fitment. That said 'Gun Tractor' could have meant a CMP truck GT! I would still be surprised that any CMPs were on active servioce by then and again wonder if it was a 'find'?
Does that make sense?