I picked up a small pile of 19 sets yesterdfay, and included with the bunch was a wireless set by Marconi numbered 86700-B-GP-15. I don't think it's military but then again I'm not a radio guy. A search of the net only produced one photo of the subject radio here :
http://www.jproc.ca/marconi/gp15.html
I'll get a shot of this one later today when I am back in the shed putting things away. Anyone with any info on these radios?