Hi Caelin,
Thought this might be what you are looking for...i'm no techie, but sure looks similar, particularly the top end of the curved horn in the article and your picture. Also seems to concur with Barry2013's thoughts as well. Good luck.
http://www.preservationsound.com/?m=201009
Of all the cults and sub-cults of audio-equipment collecting, few are more rarefied and costly than collecting antique movie-theatre equipment; especially equipment made by the Western Electric Company (hf. WE). I won’t go into WE; the company had such a complicated history filled with intense government regulation, so tightly intertwined were they with the communication industries in American life; check out wikipedia for the details. Suffice to say that, along with RCA, WE was a main manufacturer of the equipment used to playback sound in movie theatres at the dawn of the sound-film era (late 1920s). Since the equipment was designed for such purpose, quality and reliability was very high. Also massive.
(from “Recording Sound For Motion Pictures,” McGraw-Hill, 1931)
Here’s RCA’s theater system from that era:
(from ‘Audels New Electric Library,’ Audel+ Co, 1931-1958)