Good grief! Oh well, what was it? Is there a Mil nomenclature for it? Not exactly a BC-1206. http://www.ebay.com/itm/Vintage-DETROLA-TUBE-SIGNAL-RANGE-FINDER-RADAR-RING-COMPASS-SPEAKER-/360477347383?pt=LH_DefaultDomain_0&hash=item53ee1fce37