Voltmeter, 1500V, WWII Japanese Aircraft Constellation whereby a red light would

whereby a red light would illuminate on the panel if this temp was reached

The problem with using this indicator was not only identifying the aircraft

preservation packaging measuring 4

but the glass and face markings are intact

Voltmeter, 1500V, WWII Japanese Aircraft Constellation whereby a red light wouldThis is a Japanese Voltmeter, 1500V. 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 is in good condition given its age. Measures 2. 5 inches diameter and ~1. 5 inches deep. The glass and case are intact and the lettering is distinct.