Turn and Bank Indicator, 4 Minute Turn, & Eyebrow Lamp
This is a Vietnam War-era Turn and Bank Indicator NSN 6610-00-169-1489 made by Midland Ross as used in the Bell AH-1S Huey Cobra Attack Helicopter and the Bell UH-1 Huey Helicopter, according to its parts manual dated 1982. Included is the Eyebrow lamp bezel.
The electrical connector has broken from the rear case of the indicator. Measures 3.25 inches diameter and 6 inches deep. Functionality of the eyebrow lamp is unknown.