Emerson 107, 1936
Approximately 14-1/2 inches / 37 cm wide.
This particular example of the model 107 uses chassis U6F, with an entertaining mix of metal and glass-envelope tubes: 6A7 mixer/oscillator, 6K7 IF, 6H6 detector, 6F5 audio, 43 audio output, 25Z5 rectifier, 2LR-212 ballast.
The radio's backside is finished the same as its front. And look at those wonderful rounded sides!