Altimeter, Mk XIIIB, 0-20,000ft, British Royal Air Force A-30 The {Gentex} H-4 was a

The {Gentex} H-4 was a further development of H-3

not gallons

We've been told that this was used in a version of the F4F Wildcat fighter

Used across many versions of US Army Air Force aircraft with navigator crew during the era

or for that B-50 that you are building in your garage

Altimeter, Mk XIIIB, 0-20,000ft, British Royal Air Force A-30 The {Gentex} H-4 was aHere is a British Altimeter (Height Indicator) Mk XIIIB as used in pre WW2 aircraft as well as aircraft during WW2, with a maximum ceiling of 20,000ft. It has the original crown symbol of the Air Ministry on the back. The knob rotates the face of the instrument to correct the scale. According to the Royal Australian Air Force 346 Types and Locations of Instruments dated 1945, this indicator was used in the Avro Anson, Supermarine Seagull V, and Short