Crossed Pennants are the Standard British small arms proof mark
If shipped to a CommonWealth Country by them after that, the C/W Country would usually stamp it with their own unique Countries Property Mark.
Canada being the C with a BroadArrow with in it.
Also, Canadian used small arms often received an Arsenal Inspectors Mark at the Quebec Arsenal. A small Crown/30 stamped on the butt of revolvers generally.
W/O the Canadian Military Property Mark of 'C/Broadarrow', I don't really see how any link to Canadian Govt/ Canadian Issue can be thought of.
If the misc markings can be linked to Armorers applied/ some Canadian Unit or HomeGuard type of Oranization, or a private purchase type of thing perhaps.
No need to Proof fire them in Canada as they had already been Proof Fired in the Mother Country of England.,,and if you take it a step further, they were also done in the USA at Colt when made.
Though the Brit laws never did and still don't recognize USA commercial non-Gov't mandated gun proof as good enough to meet their standards.
Added:
If it was Proof Tested in Canada, the Proof Mark would be
a Crown / Crossed Pennants w/ letters D C P in the 9,3 & 6 o'clock quadrants of the pennant staffs
DCP for Dominion of Canada Proof
The only small arms I can recall being so proofed were those actually mfg'rd in Canada..the Ross rifle(s) prior to and during WW1,,& the Inglis HP and the LongBranch #4 .303 rifle during WW2.
Can't think of any others.
Ross rifles were built at the Quebec Arsenal. They often have an Inspectors Mark of Crown/1 on them from the Arsenal inspection there.
Just my thoughts