[Milsurplus] Re: Yet Another Unknown Set (With the Link!)

[Hue Miller]

My guesses:

Actually i think the fellow who said shop-model or shop built was likely
correct, no homebrew or kit would have a stamped serial number. 

YN= "year number", i.e.  date code
MN= "model number" or what the radio was named

Designed to fit in a small case, or else power lead would have come out the
back., and also to be transported "knocked down" or with tubes and coil
removed, else there would have been a front panel screening tubes and coil
from the operator. Otherwise, for not - miniaturized receivers, not having a 
front panel is poor building practice, and the builder of this receiver surely
knew that.
Prototype or demonstration model or limited production for what purpose,
though?
-Hue Miller