These are pictures of my MKII made by RO & CO or Rubery, Owen and Company
The picture below shows the liner.
This is not an Original British liner but a Dutch post-war liner.
The picture below shows the markings in the helmet shell:
You can't see the complete heat stamp, it is partialy covered by the chin strap lug.
Only the lot code NP and the date stamp can be seen.
The lug its self has also a date stamp.
This picture shows a different lug. There is no date stamp on the lug it self and it shows more of the helmets heat stamp. There wasn't a lot of attention for where precisely the heat stamp was placed.
In my next article I will show additional pictures of a MKII helmet liner.