Hydraulic Pressure Gauge, 20 PSI P-51 While "Elgin" cannot be found

While "Elgin" cannot be found on the watch or the packaging

its use in the aircraft evidenced by the dog-eared binder and some pages

Many of these instruments were common in the US Army helicopters used during the Viet Nam War

The alternating Munsell green and white markings were typical of US Navy aircraft instruments

See photo of HE 111 instrument panel

Hydraulic Pressure Gauge, 20 PSI P-51 While "Elgin" cannot be foundHere is a aircraft Hydraulic Pressure Gauge, 0 20 PSI, made by Manning, Maxwell, and Moore, part number 6730 03. It is in fair condition. The glass and case are intact. Measures 2. 25 inches diameter and ~2 inches deep.