[Premium-Rx] Info needed on Sylvania R-1414/URR receiver

[WF2U]

Hello Group,
This may not be a contemporary "Premium RX" but it certainly appears to have
been in its day...
A friend of mine acquired an R-1414/URR receiver, apparently manufactured by
Sylvania, according to markings on some modules. There is no
government/military nomenclature or manufacturer's tags, but R-1414 is
scratched on the chassis (is it an NSA special?).  This is a solid state
LF/MF/HF receiver, with Nixie tube frequency display.  It works well, but a
manual/copy is needed.
The receiver photo can be seen at
http://mbendror.mystarband.net/images/R-1414.jpg  .

Any info and/or documentation would be appreciated.

Thanks,

73, Meir WF2U
Gowensville, SC