You can find an excellent resource for these Checy trucks here:
http://vehiclesofvictory.com/chevy-g506/specifications/
According to the chart, your truck was built...
9 - in Norwood, Ohio, USA
NR - model G7163, Telephone Body, with earth borer (from SNL G-506)
46 - in October, 1944
1468 - was the 1,468 unit produced.
Needless to say, I am very jealous! That looks like a VERY complete, original example of a realtively rare truck!
More photos PLEASE!
Item Co., 23rd Inf. Regt., 2nd Div. WWII HRS
(Retro-Roco)
Bloomington, IL
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1942 Chevy 1-1/2 ton cargo w/ winch
194? Ben Hur water trailer