Voltmeter, 1500V, WWII Japanese Aircraft Constellation and resetting is simplicity itself

and resetting is simplicity itself

which is designated by a vertical dash on this one and by a small aircraft silhouette on the I-65)

The compass is affixed to a mounting bracket

With a serial # AC42-670

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

Voltmeter, 1500V, WWII Japanese Aircraft Constellation and resetting is simplicity itselfThis 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.