Original WWII German Helmet with liner and chin strap

We found this helmet in the attic of a house we were emptying out. It had a WWII German armband with it, so it seems to be a genuine German helmet from WWII. The liner and chin strap are in tact. The end of the chin strap has a stamp that looks like "RENr 0/0494/0008". It's a little hard to read. The helmet has a stamp inside the back that looks like a 3, a backward 3, and a 7. Beneath that is a number--maybe 3941. Please send a message if you need any more information or more photos. Thanks!