Original U.S. Vietnam War US Navy Pilot Dual Visor APH-6CMSI Flight Helmet by Sierra Engineering Co. with Original Early “Bowling Ball” Bag Breda M-37 secured either side of the

secured either side of the helmet via black-framed apertures

As time went on even NCOs were able to use minimalized examples

The rear receiver cup base is marked with serial number 6258 / e

[8] From there they were able to pour a steady fire upon the soldiers commanded by Lt

There are traces of the original "Naval Engagement" engraving on the cylinder

Original U.S. Vietnam War US Navy Pilot Dual Visor APH-6CMSI Flight Helmet by Sierra Engineering Co. with Original Early “Bowling Ball” Bag Breda M-37 secured either side of theOriginal 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