These pictures show my only Canadian Helmet. It's the same as the British MK II. I know this helmet is made in Canada in 1941 by the letters stamped into the metal. GSW = General Steel Wares, the manufacturer from Toronto Ontario in Canada. You can see the MK I stamped near the GSW. The letter Y is the lot code.
The liner in this helmet is probably not original, I think it's a post-war dutch liner.
Hopefully, I can obtain an original Canadian-made liner in the future.
I found additional information about General Steel Wares at: