Anti-Aircraft Artillery Range Indicator, US Navy, Mark 1, 1944 Cold War The B-7 Engine Gage Unit

The B-7 Engine Gage Unit displayed 3 metrics with one instrument:  Oil temperature (from 0-100 deg C)

This item has a serial number prefix of AF-52

plotting its change in location with the timed plotting mechanism to determine aircraft course

This indicator

The glass is clear and the lettering distinct

Anti-Aircraft Artillery Range Indicator, US Navy, Mark 1, 1944 Cold War The B-7 Engine Gage UnitHere is a WWII USNavy Range Indicator, Antiaircraft Gunnery, Mark 1. It is a hand held finder used to ascertain the range of an enemy aircraft based upon its known wingspan. They were only as accurate as the observers knowledge of aircraft identification and of course, how rapidly he could spot, identify, track and calculate the information to pass this on to the gunners (usually manning 20mm to 40mm guns or a 3" gun mount typically used on auxiliary