I was going through a local "thrift store" the other day and came across a US Army steel pot helmet and I bought it. It has the liner in it also and it was only $1.99. No dents or holes and it is still O.D. green. Does any one know if there are any markings any where on it that will date in some way or on the liner? Or a web site that will show the different mods (if any) to that style of helmet over the years. Thanks folks.