Original U.S. Vietnam War US Navy Pilot Dual Visor APH-6CMSI Flight Helmet by Sierra Engineering Co. with Original Early “Bowling Ball” Bag MG 42 though the leather has darkened

though the leather has darkened due to sweat and age

The factory in charge for the pilot production starting in December 1942 was the Sestroretsk Tool Factory

which would indicate where the fuses were stored in the frame

These are totally original

Original U.S. Vietnam War US Navy Pilot Dual Visor APH-6CMSI Flight Helmet by Sierra Engineering Co. with Original Early “Bowling Ball” Bag MG 42 though the leather has darkenedOriginal Item: Only One Available. At the end of the 50's the APH series helmets introduced a new generation of flight helmets characterized by the external visor covered with a protective shield. Improvement of the communication system, internal liner and oxygen mask retainers was also made and in some versions the dual dark and transparent visors system was installed. These types of helmets were the US Navy and USMC standard jet aircraft headgears