Pressure Gauge, 20PSI, PN 6400-C4B1-A5, Bureau of Aeronautics, US Navy He-111

Pressure Gauge, 20PSI, PN 6400-C4B1-A5, Bureau of Aeronautics, US Navy He-111Here is an aircraft Pressure Gauge, 0 20PSI, made by Bendix for an aircraft of the US Navy. It has an R88 I Navy stock number from the 1950's. Measures 2. 25in diameter and ~4in deep.

upon observing the flag/arm positions

6 inches high

Here is an Altimeter used in early military aircraft of the US Navy

and the inside is slightly dusty

Here is an authentic WWII-era German Recognition Manual for Aircraft of the British Royal Air Force

FL dated 1950

drift meters

Made by Electric Auto-Lite with a serial number prefix of AF43

We aren't certain

the indicator displayed total fuel quantity up to 16

As pressure drops

Ten-thousands of feet were indicated by a third and smallest pointer