Directional Gyro Indicator, Japanese Army Aviation A-28 Hudson The MC-125 Tuning Unit is

The MC-125 Tuning Unit is a component of the WWII-era airborne communication system Receiving and Transmitting Command Set SCR-AJ(and AL)-183

The unit requires the correct electrical input in order for the knob and sphere to function

which has not been checked

The glass and all markings are intact

Directional Gyro Indicator, Japanese Army Aviation A-28 Hudson The MC-125 Tuning Unit isThis is a WWII era Directional Gyro Indicator, as used across many different aircraft of the Japanese Army. It is in exceptional condition given its age. The gyro is uncaged when the knob is pulled out, allowing the compass card to float freely left or right to indicate the course of the aircraft. Measures ~4 inches square and ~ 4 inches deep.