You might well be correct, but I am not yet fully convinced. I did get that info from TRRS and am certainly aware of inaccuracies in that tome. I was under the impression the roundel (with it's D^C) was applied at the factory along with the model and serial #, and would pre-date military ownership. In my mind, that reinforced the statement that D^C is not an ownership stamp. I was under the impression the stamp might reflect the rifle having been made in the Dominion of Canada. I have certainly seen many broadarrow within a "C" and double broadarrow stamps and always considered them to be the ownership and released for sale stamps. I find it difficult to reconcile there being two different stamps with the same meaning. This rifle does not have markings on the right cheek and I don't believe that area has been sanded - at least not to any degree. The possibility does exist and I need to take a closer look.
On a separate but related note: what is known about the style, size and orientation of the S/N under the butt plate on this rifle? I do have an example of an issued Mk II with the same format under the butt plate as well as the same number on the right cheek. It is the only Ross I have seen with the S/N in both places.
Any thoughts on that odd S/N with the first digit rotated 90 degrees? To my mind, that is perhaps the most interesting aspect of this rifle.