The proof marks are indeed as you say. I believe that the 476W.R. cartridge was only introduced by W.R. in about 1906.Unfortunate can't post pictures (don't know how) but the rifle looks exactly like the one featured in Ross Seifried's article in the DGJ book 3 2004, except for the front sight.Great wood and finish to the gun; it appears to be of very good quality.