[Boatanchors] What is this military receiver?

[Greg Miller]

 Hi all!
     I picked up a military receiver at a garage sale today and I need some
 help identifing it (the id plate is missing).
     It's a rack mounted receiver made by Clarke Instruments (Div. of
 National Electrical Machine Shops Inc., Silver Spring, MD) which covers
 175-260 MC.  It has the following controls: audio gain, power, AFC (off,
on,
 external), fuse, op/stby, tuning (including a gear driven disc scale
above),
 a speaker on the front panel and two meters (made by Burlington) for tuning
 and signal strength.  It has a date code on the back of June 5, 1954.  The
 back panel has the following: input jack (so-239), ac, ext. afc(screw
 term.), ext. meter(screw term.), recorder(screw term.), 10mv adj.(pot),
 recorder f.s. adj.(pot), disc. bal.(pot), panoramic output (bnc), and
output
 (so-239).  It has the following tubes: 6J4, (2) 6AK5, (3) 6CB6, 6AL5, 6J6,
 (3) 12AU7, 5V4G, and a VR-150.  There is a schematic on the bottom cover
 that says "Model E".
     Can anyone tell me the military model number or any other info. for
this
 set?  I can email some pictures if that would help.

     Thanks and 73,
     - Greg