I’m hoping to get some clarification on a high pressure M1 helmet liner I have. It’s an MSA with khaki suspension webbing, an M.S. & S.M. sweatband and black non-magnetic A washers. Sounds like WW2, but there is no grommet over the front rivet. I have read various articles on these, and somewhere I read that the lack of the grommet may have occurred in some WW2 liners. However, most articles state that the grommet is in all WW2 liners and then deleted in post-WW2 liners. I’ve also read that MSA ceased making liners at the end of the war, so if it’s MSA it’s WW2. But other articles say MSA, along with Westinghouse and Capac, resumed making liners for the Korean War. Can someone clear this up for me? I appreciate any help. Thanks!