I saw a pristine sample of such a truck sitting on the shoulder of I 84 today near Boise.
But it was red, a crewcab, and appeared to be fully restored from what I could see as we passed doing 65 mph.
They did not make a lot of 6-pack cabs in those days. Most of the ones they did make were either USFS green or UPRR yellow. I bet this old girl is worth a fortune.