Is it an old Bendix T12?
I've been around long enough that I immediately figured out the controls in Jay's picture, except for the unmarked knob next to the test button. Is that for fine-tuning?
MW AM radio - that takes me back. Who says nostalgia ain't what it used to be!
Radio Luxemburg 208
Radio Caroline 199
Radio London 266
I remembered the first two but had to look up Radio London's wavelength.