the blade style is very different from Scandinavian knives I have seen.
And the back end does look like a 'glass breaker' sort of addition.
That's why I am leaning toward a homemade knife-someone in the 30-50's who came from the old country, then looked at some of the knives like western cutlery etc and kind of built his own.
The guard- basically a thin piece of straight metal, just looks home made to me.
That doesn't mean its bad- just home made.