Original U.S. Vietnam War Era Named Helicopter Pilot SPH-4 Helmet by Gentex - Service Worn Martini-Henry Rifles especially due to its stability

especially due to its stability compared to other grenades of the same period

There are no internals

From research we can see that C

built in 1881 with Assembly Number 3268 on loading gate

Original U.S. Vietnam War Era Named Helicopter Pilot SPH-4 Helmet by Gentex - Service Worn Martini-Henry Rifles especially due to its stabilityOriginal Item: Only One Available. This is a United States Helicopter Flight Helmet type SPH 4 made by Gentex. The helmet is in overall excellent, complete condition with the liner, headset, tinted visor and boom microphone. This is a service worn example, although still in fantastic condition, it is worn, scuffed and faded, all indications of a great service worn helmet! This is a rare Vietnam era original helicopter helmet in wonderful complete