Here is a scan of what is in
"The Observers Fighting Vehicles Directory WW2", Revised Edition by Bart Vanderveen on the Earth borer.
You will note that it is NOT the military cab and body work so I suspect it is in fact a 4 X 4 version of the Civilian Model and this makes sense since it took over from the COE models. Only 100 were made so this makes it very rare and it is possible it is in fact extinct! I beleive the truck in the other thread is in fact either a Chev 4 X 4 or a modified CCKW 6X6 and not an original GMC-CCW. This is only my opinion based on the couple of old photos shown.
The scan is on it's side so I could make it as large as I could here on MLU
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Cheers
Cliff Hutchings
aka MrRoo S.I.R.
"and on the 8th day he made trucks so that man, made on the 7th day, had shelter when woman threw him out for the night"
MrRoo says "TRUCKS ROOLE"