An excellent example of a genuine complete Vietnam War era U.S. M1 helmet. The M1 helmet was made by Ingersoll who made helmets for the U.S. government during the Vietnam War between 1965 to 1968, it has a heat stamp number of: I - 1853, the chinstrap has anchor markings to the metalwork. The genuine U.S. P64 liner is in excellent shape and was made by Marmac, has ink DSA (Defense Supply Agency) contract markings to the suspension webbing and was made in 1968. The genuine U.S. sweatband is also DSA ink contract marked and is dated 1969, and has a genuine DSA contract marked nape strap dated 1965. The genuine U.S. Mitchell cover is the scarce twill variant and is DSA contract marked dated 1967, around the outside of the cover is a good quality elastic helmet band with correct foliage colour and ink markings to front. A very nice complete M1 helmet.