It does not include a liner. It comes with camo netting.It has stamps has shown in photo 6, but I cannot make out anything other than a "4606" stamp. You will notice in the 7th photo, the helmet was damaged and repaired.
My late husband was an avid collector of WW1 & 2 Militaria and he marked this as being an M1942, ET66. I would also greatly appreciate it if any experts out there can tell me more about this. The item "WW2, World War II, GERMAN HELMET M42 SIZE ET66 STAHLHELM Original" is in sale since Thursday, February 13, 2020.
This item is in the category "Collectibles\Militaria\WW II (1939-45)\Original Period Items\Germany\Hats & Helmets". The seller is "blackmesatradingpost" and is located in Espanola, New Mexico. This item can be shipped to North, South, or Latin America, all countries in Europe, Japan, Australia.