Voltmeter, 15V, WWII Japanese Aircraft Martin designed for aeronautical use

designed for aeronautical use

as used in large aircraft in both British military and civil service during the 1950's in Reconnaissance/Bomber aircraft such as the Avro Shackleton and English Electric Canberra

which would likely be determined by the type of aircraft to be refueled on a mission

the pointer indicates altitude along the inner green scale

Voltmeter, 15V, WWII Japanese Aircraft Martin designed for aeronautical useThis is a Japanese Voltmeter,15V. 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.