Please identify this British helmet!

[excdrac]

Dear all,
Please help me identify this helmet. Is it MkI or MkII? I am not able find any markings inside. It was made from non-magnetic steel.
Thank you!

[KradSpam]

Non magnetic steel?

[Jerry B]

Non magnetic steel?

So it does not affect a compass. They came in different grades.

[excdrac]

Ok, I am not an expert. I thoght it is useful info....

[Gary J]

By the liner fixing screw, I would estimate the date of the helmet as 1939 - 1940 .. Mk2

Gary J.

[excdrac]

Thank you!!!!

[MySonsDad]

Never mind, I corrected myself.

Russ