[R-390] EAC R-390A - American Embassy Duty

[Bill - KK4XO]

I have an EAC R-390A which will be going in for a complete
repair/restoration later this year.  In the meantime, I am trying to learn a
bit more about the history of the unit.  I know for sure that it came from a
storage room in the American Consulate/Munich, Germany, but was not on any
State Department equipment inventory which would indicate that it was
probably used by another agency within the Consulate building there.  It is
very clean and appears to have seen little real band-switch usage which
makes me believe that it was possibly used to receive a single guard
frequency or to monitor a single fixed broadcast station channel - perhaps
by FBIS or VOA monitoring personnel.  The only other real clue as to who may
have used it originally is on the Technical Material Corporation Model LSP-7
dual speaker rack panel which still has two red Dymo embossed labels - one
indicating "AN-47" and the other indicating "VRA-6".  My guess is that these
were two different antenna systems attached to two different R-390A's
monitored between the two switched speakers.  Indeed, through internet
searches, I've learned that the VRA-6 was an 18 foot vertical receiving
antenna which was used by various USG and DOD agencies overseas.  I have, so
far, been unable to find any information as to what the "AN-47" may have
been.  There are signs of another embossed label above these two but
unfortunately it was missing when I received the unit from another Ham
operator and ex-State Dept employee who was told to "get rid of it" in the
early 1990's..being a Ham, he took it home rather than "deep six" it in a
dumpster.

Can anyone on the list help with the "AN-47" part of this mystery?  

Thanks,

Bill, KK4XO