[Boatanchors] Mystery National Receiver, NC-127D

[rkerr]

I have an interesting old National receiver with no documentation, 
labeled model number NC-127D.  It appears very similar to the NC-101XA, 
but it's painted battleship gray and has a rack mount front panel with 
handles.  There are more control knobs on the front panel than the 
-101XA, and the S-meter is located at the upper left corner of the front 
panel, rather than behind the near left side of the tuning dial 
escutcheon as in the -101XA.  It tunes from 540 kHz to 30 MHz.  The 
knobs are an off white color.

A tag on the front says "Order number 2507" and gives a manufacturing 
date of 6-1-45.  The serial number is "1".  I have it from the former 
owner that the "D" stands for diversity, and that it was designed to be 
part of a diversity reception system employing at least one other 
receiver like it.  There is a coax connection on the back for 
import/export of the local oscillator signal, but unfortunately I have 
only one radio.

Does anyone out there know anything about this radio?

Bob
WB4TGG