I have the impression that the Wiener Schnappermontage is seen on some English rifles. Perhaps one of the makers there had a liking for them. Greener set up a .280 Ross with a Zeiss prismatic using these mounts, which a Lt. Greener of the same family used for sniping in WWI. I have a Goerz Pernox 3.5x with these mounts. I understand this system was used by the A-H army in WWI for sniping with the Steyr M95, usually with the Kahles Mignon.