Gun Sight, Reflector, Type N-6A SB2C Helldiver This is a mechanical WWII-era

This is a mechanical WWII-era aircraft clock

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

According to the Maintenance and Interchangeability Chart dated Feb 1945

The serial number prefix

Gun Sight, Reflector, Type N-6A SB2C Helldiver This is a mechanical WWII-eraHere 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