[Milsurplus] Hoffman 201 ?? Receiver ??

[Hue Miller]

Anyone know more or have pointer to more info 
on the Hoffman Laboratories 201 (best guess on
number) Radio Receiver?
Rack mount, but taller by 50% to R-390, looks like
it tunes 2 MHz bands, slide rule dial marked in 500
kHz marks, mechanical digital 3 digits on right of
slide rule, count off the kHz. Must have been a 
very heavy, and expensive, beast. I wonder how 
many they built?
( From a collection of Hoffman Labs, LA CA, photos.)
-Hue Miller