The piece of radio history was standard equipment aboard British Lancaster bomber aircraft during and after WW2. This example comes in its original box and appears to have never been used. The bottom of this “bathtub” style key features four holes, presumably for securing the key to the operating position aboard the aircraft.
This unit has a hairline crack in the bakelite of the top section. Look closely at the side view picture. Otherwise, it’s in very good condition. The cardboard paper box is in good condition with expected wear from 70 years of shuffling from place to place.