Gun Sight, Reflector, Type N-6A SB2C Helldiver According to the Maintenance and

According to the Maintenance and Interchangeability Chart dated Feb 1945

and the interior side of the glass requires cleaning

This is a De-Icing Pressure Indicator for the de-icing system used in WWII US Army Air Forces aircraft such as the B-17 Flying Fortress

anti-aircraft gun mounts

Gun Sight, Reflector, Type N-6A SB2C Helldiver According to the Maintenance andHere 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