Original U.S. Vietnam War Era Camouflage HGU-26/P Flight Helmet with Oxygen Mask and Helmet Bag Lee-Enfield (SMLE) however this example only has

however this example only has the button on the right flap

In 1942 there came two more manufacturers

Nearly all of the original paint has been retained with just minor areas of loss

There are still visible maker markings under the shield

The base of the bayonet is marked with serial number 19675

Original U.S. Vietnam War Era Camouflage HGU-26/P Flight Helmet with Oxygen Mask and Helmet Bag Lee-Enfield (SMLE) however this example only hasOriginal Item: One of a kind. The HGU 26 P request for nomenclature is dated Jan 14, 1970 and is based on the HGU 22 P Helmet Shell. There is no military specification detailing exactly what goes into an HGU 26 P but until the appearance of the single visor HGU 26 P both USAF and manufacturer information was consistent in describing the HGU 26 P as an HGU 22 P helmet shell with a PRU 36 P side actuated double visor. Sierra Corp and Gentex Inc sold