USGI M1 Helmet; Paratrooper, Franken-helmet, not really sure?

[ct241]

Pictures: USGI M1 Steel Pot Helmet - Album on Imgur

I bought this front seamed USGI pot helmet and liner from Numrich a while back and I'm trying to learn a bit about its history. From what I gathered, I think its a late WWII helmet and liner that has been modified to be a paratrooper's helmet. I don't know what the "PM50" means. I've also not found any markings indicating the manufacturer.

What parts am I missing and how can I restore this to a correct condition? It seems like its a hodge podge of random parts on a helmet but I'm probably wrong!

Information

Warning: This is a relatively older thread This discussion is older than 360 days. Some information contained in it may no longer be current.