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 There is also the usual

There is also the usual hook next to one hanger

Created by the Sweeney Litho

The top of the cap exhibiting scattered signs of mothing

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 There is also the usualOriginal 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