While perusing Gunbroker auctions I found a commercial Ross 1905 for sale with a sight I was unfamiliar with. I had a good look through the chapter on rear sights in the Ross Rifle Story and didn't find any description of this particular sight although it shares a feature of the "Sight Bridge" manufactured by the CanadaTool and Specialty Company of New Glasgow, N.S. I'm interested in hearing if anyone is familiar with this sight.