Original (not reproduction) US Army Vietnam War period M1 helmet with liner, Suspension is dated 1969; headband is dated 1970. The helmet has heat stamp number 1 5642 indicating the manufacturer Ingersoll Product who were a Vietnam War period contractor. The liner is marked in the crown with "US 28" indicating the US Govt owned die number. Complete with original Mitchell pattern camo cover with 1964 Contract numbers and original period elastic band. Very good used condition.