I bought this liner on ebay a few months ago. It was a set with a Schlueter front seam M1 with OD7 chinstraps. Upon closer inspection I believe it to be an over painted Westinghouse Jungle Liner. It has unpainted A-washers and folded under nape ends. The leather chinstrap has DOT rivets so I believe it is probably from a p58 liner. I have compared it to all the examples i could find online and the "ghosting" of the under paint seems extremely similar. Additionally the scratches on the body and rivets reveal other colors rather than the "tortiseshell."
Is it possible this is one of the factory repainted Jungle Liners?