Most of the Canadian revolvers have a C 30 stamp somewhere on the frame. The mark you show are opposing broad arrows. The Broad Arrow when stamped as an opposing pair denotes official disposal or 'sold out of service'.
This broad arrow description is correct. When the revolver is accepted into British & possessions (Canada) military service, a broad arrow is applied. When sold out of service (deassessioned), an additional broad arrow is applied point to point with the acceptance arrow.
The Canadian government mark is a vertical broad arrow enclosed inside a larger "C" indicating Canadian acceptance. There are usually additional British & possessions marks such as crowns, E's, II's, etc.
The "Crown 30" mark on all examples I have seen is the only mark and on the heel of the butt near the lanyard ring. These are almost always in exceptional condition. I believe these revolvers were shipped to the Canadian Government in Ottawa, racked/stored, and never issued. Just my opinion and worth what it costs.
If your revolver has Crown # on the butt AND broad arrows, I would be extremely interested in seeing all of the pictures you would be willing to provide. It will severely alter my thinking, what little I do.
Typical Canadian issue excepting only that this revolver has been altered to accept 45 long Colt as well as the original 455 Webley cartridge:
Typical Crown 30 mark at heel of butt, although most are not in quite this condition. This revolver appears unfired & letters to Ottawa:
