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					Originally Posted by Grant Bowker  I haven't seen that hole before so my guess is that either it was done after military use or might have been done to provide a way for people in the rear body to communicate with the driver. | 
	
 Neither do I. My bet is a post-war mod.
Also interesting to see that someone installed extra vent doors in the sides of the nose panels.....and L-shaped strengtheners securing the cab rear wall to the floor. I also spot remains of non-standard dash gauges in the gauge cluster and the obvious bars keeping the roof attached to the rest of the cab while driving at speed!
Interesting find Mariano!