Ammeter/Voltmeter, WWII Japanese Aircraft Douglas

Ammeter/Voltmeter, WWII Japanese Aircraft DouglasThis is a Japanese Voltmeter or Ammeter. The scale is labeled to a value of 2. 0, and "2000V" is embossed in small lettering in the upper right of the dial, so we aren't sure of the exact function or application. It is presumed to be a WWII era indicator used in aircraft of the Japanese Army or Navy. This has not been verified. Aircraft that may have used this have not yet been identified. It has the "YEW" symbol of the Yokogawa Electric company on

It has date stamp of January 1951 and Boeing tamper evidence seals

which were selected by rotating the center knob below the frequency band window

all documentation we've seen on these aircraft illustrate the type B-5 ignition switch

and US Navy versions R4D 6 & 7

This is a fine specimen of a WWII-era British Engine (or Cylinder Head) Temperature Indicator

By rotating the sight to align with the angle of terrain travel vs the intended aircraft course

It is labeled Fl

Fuel Quantity Indicator

It has a screw-type heeling compensator

The H-4 was equipped with a boom mounted microphone M-6A/UR to be used below 10

medium bombers

combining directional finding and general radio signal receiving