I have 3 helmets that I need help with further identifying and a price value of each. I believe the first is an Italian Tankers leather helmet with liner which I dont have a year for. The second I believe is a WW1 German m1916 / m1917 helmet with only the shell which I dont have a year for. The third I believe is a WW2 German Luftschutz Civil Defense helmet with liner which I again dont have a year for. Any help in confirming, indentifying or giving a value for each would be much appreciated!