These "Dreifuss-Einhakmontagen" = three feet clawmounts were the most popular mounts in Germany, used almost exclusively on Mannlicher - Schoenauers here. The in-the-white parts were most often provided by EAW, and fitted, mounted and finished by the individual gunsmithes who retailed the rifle and/or the scope. The mounts provided as "Factory options" by Steyr were mistrusted by German customers, as were all side mounts. Pre-WW2 Steyr offered Kahles "Mignon" or "Heliavier" scopes in a variation of the Vienna snap on mount as a factory catalog option, but apparently these mounts were made and installed by outworkers in the Steyr area, as they are all slightly different, even if the same scopes are mounted on the same rifle models. Post-WW2 the factory offered a peculiar swing mount of their own design. I have yet to see such a "Steyr factory swing/pivot mount" here in Germany. Both types of "Steyr factory" mounts, post-and prewar, were shown in this thread:
http://forums.nitroexpress.com/showflat.php?Cat=0&Number=130916&an=0&page=9#Post130916