Original U.S. Vietnam War USAF Flight Helmet Oxygen Mask by Sierra Engineering Co. Martini-Henry Accessories The pack is in good

The pack is in good condition and appears complete and without severe damage

The receiver area still has some of the original case hardening on the internals

- Douglas A-4 Skyhawk

which is set directly into the barrel

Original U.S. Vietnam War USAF Flight Helmet Oxygen Mask by Sierra Engineering Co. Martini-Henry Accessories The pack is in goodOriginal Item. Only One Available. Heres a great piece often missing from Vietnam War flight helmets, the oxygen mask. This mask is in fantastic unissued condition and would pair beautifully with a helmet. The mask retains its original tube without any serious damage. There is a makers tag on the end piece reading: 92114 ASSY 232 94A SIERRA ENG. CO. The rubber mouthpiece is also marked: OXYGEN, MBU 5 P SIZE REGULAR NARROW FSN 1660 794 0855 This is a