Original U.S. Vietnam War USAF Flight Helmet Oxygen Mask by Sierra Engineering Co. Martini-Henry Accessories The receiver area still has

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

The word agate is "achat" in German

It was very common for a soldier to specialize in specific items

This is an excellent condition high grade Rural Police 1936 Officers pattern Tschako

Original U.S. Vietnam War USAF Flight Helmet Oxygen Mask by Sierra Engineering Co. Martini-Henry Accessories The receiver area still hasOriginal 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