british? helmet, pre ww2?

[ILH]

Hi,
I don't know much about pre ww2 british helmets so I'm hoping for some help, please:
I can not find any marks stamped into the steel. There is a rectangular red ink stamp and various black marks inside the liner but i can't read them... read somewhere on-line that the red stamp means that it is pre 1916, so can anyone confirm or deny that this helmet is:
A) British?
B) ww1?

Also, does anyone know what the writing on it is about? I can't make it all out but it apears to say:
A28 DC5
?NS
SQN???HBW
H?? 6323
9
74

THANKS,
jim
PS i will post my 1939 helmet, once i've dug it out.

[Jerry B]

It is WWI, but circa 1917 not pre 1916 I would say. the chinstrap lugs appear a bit odd with one of them having been changed/repaired. British shell s have split logs on the chinstraps not peened over rivets.

No real idea on the writing on it, perhaps flying related?

[ruddersrangers44]

I've never seen a Liner retaining bolt with a head that large,usually they were really small welded pins.............certainly had some alterations made to it.................

[NCA]

Never seen a late ww1 helmet with a stainless steel rim?Strange no?

[asterperious]

looks like a WW I liner added to a WW II or postwar belgian helmet shell

[ILH]

There seems to be some disagreement, so i think I need to get it apart and look for further marks.