Rater of Climb / Vertical Speed Indicator, Pre-WWII WW1 It is new old stock

It is new old stock in its original box

The drum can be removed and the chart replaced as needed

fuhrertocterkompass

Peoples Liberation Committee

The US Army Air Corps fighter P-39 Airacobra is an example of an aircraft which used this venturi

Rater of Climb / Vertical Speed Indicator, Pre-WWII WW1 It is new old stockThis is an early Pre WWII era Rate of Climb Vertical Speed Indicator, measuring climb or descent up to 2,000 ft per minute. Made by Pioneer, part number 321 1177. At 2. 75 inches diameter, the face is smaller than WWII era indicators. It is ~3. 5 inches deep. The glass is clear and the markings are superb.