The Westerner was a two channel amp with 4 6AQ5 power tubes. The horseshoe and leatherette motif were perfect for Western country/swing bands with a steel guitar.
The 6AQ5 was a 7-pin version of a 6V6, however it cannot handle high plate voltages like a 6V6. In this M-320-B configuration, with 315VDC on the plates, the four 6AQ5's probably produce somewhere between 20W and 30W.
Photos and Schematic courtesy Jon Blick, Milwaukee.