Hi Mark, Thanks for your beyond-the-call-of-forum-duty on this one! It's a fun challenge to try to track something like this down, no?
I think maybe I've got it, or at least a pretty good guess: Royal Winnipeg Rifles.
Here are images of their cap badge and unit insignia with motto. Notice the stylistic similarities between the devils head insignia on the helmet and the head of the devil in the attached images, particularly the one with the green background. Their historic nickname was the "black devils." I considered this unit before, but since the helmet insignia shows a red
devil, I rejected this theory. However, the background on the cap insignia is red, so I think a red colored devil might have been used as a short hand reference for the more elaborate overall unit coat of arms.
Lacking a better candidate, I'm tentatively calling it a Royal Winnipeg Rifles helmet.
Here's an excerpt from Wikipedia explaining the name:
The 90th Winnipeg Battalion of Rifles were formed on 9 November 1883 under the command of Lieutenant Colonel William Nassau Kennedy. Within two years of formation, the 90th battalion served in the 1885 North-West Rebellion, fighting at Fish Creek and Batoche. The regimental Latin motto is Hosti Acie Nominati, which means “named by the enemy in battle”. After the Battle of Fish Creek during the North-West Rebellion of 1885, a captured Métis asked, "The red coats we know, but who are those little black devils?", a reference to the fact that while infantry of the line wore red coats, the Winnipeg soldiers were clad in traditional rifle green. From that point on, the 90th Rifles (and later Royal Winnipeg Rifles) became informally nicknamed the "Little Black Devils".
Hi Mark I really like this Mk II as you well know
and I have checked every reference site that I know and have spent hours comparing images with still no luck.
I know I have seen this particular flash before
but I will be dammed if I can find it again if I do come up with anything I will be shur to let you know.