Due to being sent a link to a rifle at the Cody Museum by a friend I looked up their online library. In this library I found a M1903 with the W&S telescope, serial #633.977. This particular rifle has the dovetail mounted to the rifle exactly the same way as mine, see [url=http://collections.centerofthewest.org/treasures/view/firearm_rifle_breechloading_repeater_selfcontained _metallic_cartridge_4#]yourself here.
Besides this I might mention that all pictures of the SA Museum offers online show the scope rail attached exactly as pictured in Brophy.