Pilot Director Indicator as used with C-1 Autopilot, WWII B-29, B-24. B-17 Dinah Reconaissance The decals are in mint

The decals are in mint condition

Here is Radar Pressure Indicator use in radar-equipped aircraft during late WWII and post WWII

so likely from a US Navy or US Air Force aircraft

this indicator appears to have a production year of 1937 (3768/37)

The lens appears to be a plastic material

Pilot Director Indicator as used with C-1 Autopilot, WWII B-29, B-24. B-17 Dinah Reconaissance The decals are in mintThe Pilot Director Indicator (PDI) was used during WWII in bombers of the US Army Air Force, including heavy bombers B 17 Flying Fortress, B 24 Liberator, and B 29 Superfortress and medium bombers B 25 Mitchell and B 26 Marauder, and US Navy's PBY5A Catalina and PB4Y Privateer. The PDI was located on the pilots instrument panel, and received signals from the bombardier to indicate his desired course changes, left or right, to obtain an accurate bomb