Remote Control Unit Type MN-28LB for AN/ARN-11 Radio Navigation System Canberra The right knob rotates the

The right knob rotates the upper compass card

the perimeter face plate is removed

so theoretically it's possible that this was used in a Boeing bomber B-50 Superfortress (developed from the B-29) which was in service during this period

As the aircraft climbs

Here is an original WWII-era all leather Tanker's Helmet from the army of Sweden

Remote Control Unit Type MN-28LB for AN/ARN-11 Radio Navigation System Canberra The right knob rotates theThis is a Cold War era Remote Control Unit, Type MN 28LB, as used in the Airborne Radio Navigation System AN ARN 11 (see spec sheet in photo gallery) during and after WWII in both military and commercial aircraft. The AN ARN 11 system was a radio compass which indicated the direction of a selected ground transmitting station and also functioned as a general radio receiver. The MN 28LB unit could be adjusted for 3 radio frequency bands, 200 410 kc, 550