Original U.S. Vietnam War Helicopter Pilot Gentex APH-5 Helmet by Sierra Engineering Company British Military Maps It is also stamped with

It is also stamped with a N / 101 on the steel back strap indicating that it was originally issued to the Royal Navy

Regrettably the chin harness is 60% rotted away

As it turned out gas was not used

The liner and attachment cord are in decent condition

Original U.S. Vietnam War Helicopter Pilot Gentex APH-5 Helmet by Sierra Engineering Company British Military Maps It is also stamped withOriginal Item: Only One Available. This is a Vietnam War era United States Helicopter Flight Helmet type APH 5 Helmet manufactured by Sierra Engineering Company in size large. The helmet is in overall excellent complete condition with the liner, headset, boom mic, and clear visor. The helmet is maker marked by Sierra Engineering Company and is a size large. This is a rare Vietnam era original rare helicopter helmet in wonderful complete condition! The