Radio Loudspeaker LS-3, Signal Corps US Army S2 Tracker and this manual is labeled

and this manual is labeled for use in TC-47D serial # 44-76314 (presume assembled/shipped in 1944

At about 170 pages

It was also used in versions of US Army Air Corps WWII fighters P-38

hydraulics

Radio Loudspeaker LS-3, Signal Corps US Army S2 Tracker and this manual is labeledThe LS 3 Loudspeaker was used during WWII with a variety of US Army Signal Corps receivers, such as the BC 312 and BC 348, and used on into the 1950's. Would have been used in ground installations (as opposed to use within aircraft, where headphones would likely have been the preferred method of rendering audio to the crew). See the photo of the interior. It appears that the components may be original and untouched. We have not tested it, so selling