Please help ID this M1 helmet

[t44e6]

I have this helmet, M310 heat code. I assume it has been refurbished, it has late chinstrap and the liner that came with is newer. Rear seam, pinch welds every few inches around the rim. I am debating on whether to part with it so I would like to know about it before I make a decision.
Thanks!

Forgive the random lighting!

Information

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[browningautorifle]

This site may help, most info about M1 helmets can be found here. Rough guide to the US M-1, M-2 M-1C shell