VINTAGE USAF AIR FORCE SIERRA FLIGHT HELMET OXYGEN MASK. IT IS NOT COMPLETE, HAS WEAR, NEEDS CLEANING AND THE NOSE PIECE LOOKS LIKE IT HAS SOME MELTING. ZOOM IN ON THE PICTURES TO SEE CONDITION. SO PLEASE BE PATIENT. The item “VINTAGE USAF AIR FORCE SIERRA FLIGHT HELMET OXYGEN MASK” is in sale since Tuesday, November 17, 2015. This item is in the category “Collectibles\Militaria\Militaria (Date Unknown)\Air Force”. The seller is “taminator1969″ and is located in Bedford, Indiana. This item can be shipped worldwide.