An excellent example of a genuine U.S. Gentex SPH-4 flight helmet. The SPH-4 helmet was first introduced into service in 1969 and saw active use during the Vietnam War as used by the Air Cavalry helicopter pilots and aircrew, it continued to be used by the U.S. (Army, Navy, USMC & USAF) throughout the 80's and 90's, it replaced the AFH-1 helmet offering better crash protection. This helmet is in excellent condition with a metallic blue paint finish with two white lines to back, it features a tinted visor with a fully working release mechanism that allows the visor to be retracted or moved forward/down. The internal webbing system is complete with quick release adjustable chin strap, and the wiring appears complete for the headphones and microphone with the intercom connection socket at the end. Its missing the original manufactures label, retains the original ink DLA (Defense Logistics Agency) U.S. contract number: DLA 100-86-C-4241 indicating it was a genuine government supplied helmet and that it was made in 1986 by Gentex. A very nice complete example of a SPH-4 flight helmet, size appears to be a Large.