*USA, Vietnam Era, U.S. Navy M1 Helmet Set, Ingersoll Products “IS79” Shell and Later Liner*
A superb U.S. Navy shipboard M1 helmet set representing the classic Cold War–Vietnam era damage-control and deck-service configuration. The steel shell is finished in dark naval blue with bold white stencilled “USN” to the front and a hand-applied white “7” to the reverse, giving the piece strong visual presence and unmistakable naval identity.
The shell is a late-pattern M1 type with rear seam rim and swivel bale chinstrap loops, retaining a blue-grey web chinstrap with darkened metal hardware. The left side of the chinstrap (as viewed) is missing its end attachment, a condition often seen on genuine service-used examples.
Inside the front brim is the heat lot mark “IS79,” identifying manufacture by Ingersoll Products (Borg-Warner), one of the recognised Vietnam-era M1 helmet contractors. The combination of IS-prefixed heat stamp, rear seam, and swivel bales suggests Vietnam-period production, despite the outward similarity to late-WWII pattern helmets.
The helmet is complete with liner and web suspension. Markings to the liner webbing read:
HEADBAND HELMET LINER
DLA 100-83-C-4378
NSN 8470-00-153-6671
Steinberg Bros Inc.
These markings identify a Defense Logistics Agency contract dated 1983, indicating later-service liner components fitted during the extended working life of the helmet. The National Stock Number corresponds to a standard issue liner headband assembly.
A small remnant of adhesive tape marked “BR” remains to the front of the liner, consistent with field-applied personal or equipment identification.
Historical Note:
The U.S. M1 helmet entered service in 1941 and remained in operational use for over four decades. By the Vietnam War period, production followed the proven late-WWII pattern incorporating rear seam rims and swivel bale loops, features designed for greater durability and continued ease of manufacture.
This example was produced by Ingersoll Products during the Vietnam era finished in naval blue consistent with U.S. Navy shipboard issue. Naval crews used M1 helmets extensively for deck duties, damage-control stations, and emergency response tasks, with blue paint and prominent stencilling aiding identification aboard ship.
As was common practice, shells often remained in service while liners, webbing, and suspension parts were replaced as required. The later liner components fitted here reflect that normal military lifecycle rather than modern assembly, illustrating how M1 helmets continued in naval inventory well into the early 1980s.
*Condition*
Good honest service-used condition overall. Naval blue finish shows expected wear, scuffs, and handling marks consistent with operational use and storage. “USN” front stencil and rear numeral remain clear. Swivel bale fittings are intact. Chinstrap present though missing the end attachment on the left side (as photographed). Liner complete with later suspension system; contract markings visible. Tape remnant marked “BR” remains to the front. Minor age-related oxidation and general wear but no structural damage observed. Please see photographs as part of the condition report.
A very appealing and coherent U.S. Navy M1 helmet showing genuine long-service military use — a Vietnam-era Ingersoll shell repurposed for naval shipboard duty and retained in service with later liner components. The strong USN markings, navy finish, and clear production identifiers make this an excellent display and collector piece representing the extended operational life of the iconic M1 helmet.
Vietnam-era U.S. Navy M1 shipboard helmet with IS79 Ingersoll shell, USN stencil and later service liner — an authentic long-service naval example.
