Model 86R

This is a piece I know nothing about.
When you first look at it you'll think it's a National
SW3, but the name tag says Clough Brengle model 86R.
Did Clough Brengle try to copy the National SW-3?
It sure looks that way to me.
It's interesting that the model number is 86R, one of my C-B transmitters is a model 87. Were they made to go together?
I sure wish it was in my collection...