I do not know what they are, but they are not Canadian just because of the "C." Canadian proofed military guns I've seen and one I own have different markings.
Lots of these guns got unit markings at one time or another, and many did service with other agencies who applied unique marks of their own. Someone may be able to ID those, but most often it's a mystery and bound to remain one. It's also possible that the markings are not related - the top one might have been a unit or military mark from wartime, the lower ones inventory marks from someone else later.