Need a little help...

I am still working on this estate sale and have been finding some neat stuff. I am trying to figure out what this is. Does anybody want to take a guess. It seems very automotive to me but I just can't figure it out. Who used the omega symbol? It is made of cast aluminum, measures almost 6" in width, has a duel lead socket with a single filament MAZDA bulb rated 12-16 volts. It almost looks like a license plate light but I think that it was used on the interior because of the finish. Can anybody I.D. this thing and put me out of my misery!