[R-390] Imperial R-390A Excessed/Surplussed by Which Branch of DOD?

[WD4INP]

I've come by an R-390A that I really want to know which branch of the military 
or other agency excessed it.

It's not Navy or Coast Guard. It's probably not Marine Corps. It could be Air 
Force, but I have an hunch it's Army. The contractor is Imperial and the con-
tract is 37856-PC-63.
 
Here's what's on a white paper tag on the receiver's back panel:
 
"5820 00 7555   B441   CC   0029
5820 01092 8435            709BOOA               [bravo oscar oscar alfa]
RECEIVER R-390AURR         2221"
 
The second line is divided in a strange manner, and means "5820-01-092-8435".
That's a National Stock Number that definitely is a one-for-one ID for the 
R-390A/URR. The "01" indicates the country that awarded the contract for
manufacture is the US. I know that "00, and "01" indicate the US, "28" 
indicates Canada, and "99" indicates the United Kingdom. 
NSNs are a creature developed for NATO.
 
I know that some clown out there (Smile, Chuck!) can tell dead certain which
branch excessed the set.
 
Also, Federal Stock Numbers (FSNs) were converted to NSNs along about 1970,
and I think that the receiver probably was excessed not long after that. 
Also, other agencies besides DOD can issue NSNs to anything, including
Tupperware
 
I suppose that's all pretty arcane information, and few people would give
the south end of a north-bound rodent about it. And that proves that I'm 
a lunatic. Dead certain.
 
Charlie 
 
Charles A Taylor, WD4INP
Grifton, North Carolina
Charles A Taylor, WD4INP
   Grifton, North Carolina