I am very new to collecting US M1 Helmets. I came across this one near me. The pictures are all I have right now. I am trying to get some more. What should I be looking for? Shell looks in good condition. Khaki chinstrap looks good. What do you think of the markings? This guy is asking for an offer which I know you do not like but I cannot change that. It seems to be just a shell and no liner. What would be a fair offer?