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Looks a lot like this one I found online.
French Military Surplus M51 Steel Helmet with Liner, New
"It’s from the 1950’s era when France had sent a battalion to fight in the Korean conflict." - quote from the website
This article might help you, too
My husband says that because the helmet has a rear seam, it dates to Korea or later. The lining, however, appears to be WWII, so it is likely these two pieces were married together in recent times.