IMO, the 'C' with the large broad arrow is later than WWI. I've got a 1916 SSA rifle that's got Canadianicon ownership marks, and it's got two different versions, the older one (again...IMO) has a much smaller arrow inside the C. I'm making the assumption that it's the earlier, since the large arrow version exists on later rifles, but I've never run across the small arrow version on anything dated past the WWI era. I've also got a WWI dated, Canadian marked action cover that appears to bear this out (small arrow).

This, mind you, is strictly opinion. If there's evidence to the contrary out there, I'll be happy to change it.