The helmet has markings of hard use of fighters but it is a complete unit with an interesting oxygen mask receivers. MB-4 flight helmets were manufactured for a Strategic Air Command (SAC) but in this case this MB-4 has been modified for USAF fighter pilot John C. Bartholf with a visor so it is making this MB-4 helmet more interesting one.The item "USAF MB-4 Flight Helmet Named Vietnam War Pilot 1957 P-4A LARGE F-4 F-100 F-101" is in sale since Monday, May 17, 2021. This item is in the category "Collectibles\Militaria\1954-60\Original Period Items". The seller is "saunamajor" and is located in Muuruvesi. This item can be shipped worldwide.