Gun Sight, Reflector, Type N-6A SB2C Helldiver and the interior side of

and the interior side of the glass requires cleaning

This is a Cold War / Vietnam War era Attitude Indicator type ARU-11/A

as used in aircraft of the US Navy such as the SBD Dauntless Dive Bomber

According to the Maintenance and Interchangeability Chart dated Feb 1945

The manual covers instruments that were eventually used in aircraft of the Air Corps US Army and Air Force US Army during WWII

Gun Sight, Reflector, Type N-6A SB2C Helldiver and the interior side ofHere is a fine example of the Reflector Gun Sight, Type N 6A, as used in gun turrets of aircraft of the US Army Air Force during WWII. From our friend Laurent at Aircraft Gunsights. com: "The N 6 was the first of the N series to be specifically designed for flexible gunnery for use in turrets not equipped with compensated sights. AAF Material Command also requested the N 6 to replace the old iron sights on all other gun positions in medium and heavy