This is a fresh ground ww2 helmet liner, has green painted A washers, od #3 shade webbing, early green painted chin strap buckle. Only a #3 on the inside of the helmet that I can see. Most likely a Firestone. Has a stamped nape strap, and leather 5 wire I believe leather sweat band.  It has two broken clips in the back that are easy to fix , but the leather on the chin strap and swart band are hard and stuff. Can use leather treatment. Tucked inside was an index card that said "donor Milton klein", most likely donated to a museum and then sold off when the museum closed . 100% original