Bendix Aviation Equipment Service Guide, 1943: Eclipse, Stromberg, Scintilla, Pioneer A-7 Corsair I have located this instrument

I have located this instrument on the engineers panel of the US Navy's floatplane JRM-1 Martin Mars

made by Pioneer

Section Four

it has two WWII aircraft etched on opposite corners

The indicator also provides visual indicator of oxygen flow similar to the WWII-era "blinker" device: as the pilot inhales/exhales

Bendix Aviation Equipment Service Guide, 1943: Eclipse, Stromberg, Scintilla, Pioneer A-7 Corsair I have located this instrumentHere is an original WWII era (1943) Service Guide for aviation equipment made by the Bendix Aviation Corporation under its brands Eclipse, Stromberg, Pioneer, Scintilla, and Friez. It covers instruments, landing gear, carburetors, magnetos, hydraulics, armament, turrets, and radio equipment. With over 400 pages, including several fold out diagrams, it is ~1 inch thick by 6 inches by 8 inches. This edition contains a misprint of pages 201 239 covering