WWII USGI/USAAF Bomber Waist gunner/Turret gunner 50 caliber Auxiliary Sight
This is an unissued WW2 USGI auxiliary gun sight used on 50 cal waist guns and turrets. Should there be a power failure on the aircraft and the electronic sight not functioning, the crew member would flip up the auxiliary sight and continue firing. The sight has a rear peep hole and front bead and post sighting. These also have been adapted for use on the 30 cal. version of the browning. See pics and feel free to email me if you have any questions, thanks.
As per the pictures there are various markings and stamps to be seen