The true collector will know more about this helmet than I do. The best I can tell is that the numbers on the helmet are 064 and R634.
You may be able to see better in the photos. My eyes arent as good as they use to be. This was one of the few souvenirs my father brought back from the War. He didnt really talk much about the war and I only found these items when he passed.My mother indicated that this was one of the items he brought back from Europe. I think this piece of history really belongs to someone who would appreciate it more than me. I do have another helmet that I will pass on to my son. The item "WWII WW2 GERMAN Helmet with Actual Liner, 100% Original, Slight Battle Damaged" is in sale since Tuesday, September 06, 2016.
This item is in the category "Collectibles\Militaria\WW II (1939-45)\Original Period Items\Germany\Hats & Helmets". The seller is "webhunter101" and is located in Lakeville, Massachusetts. This item can be shipped to United States.