Well, that's a new one to me. Looks to be mounted on a Mannlicher-Schoenauer? If so, Please post info to the Mannlicher Collectors Association.
Steve, no need to contact the Mannlicher Collectors. As a member, I already answered questions on these mounts for them.
The photo mentioned above, posted here again, shows my floor, my rifle and my scopes, a Kahles, Vienna "Mignon 4x" on top and a Kahles "Heliavier 4x" below. The Heliavier sits on top of my M1924 Mannlicher-Schoenauer in 30-06.
Here is another Heliavier on another M1924 "Sequoia" Mannlicher Schoenauer:
and a third one:
Note: though the scopes are the same and all three are mounted with the three-legged snapper mounts on Mannlicher-Schoenauers, all three mounts differ in detail. These mounts were offered pre-WW2 by Steyr as a "factory option", but apparently they were handmade by outworkers/ gunsmithes outside the factory, so nothing is interchangeable. These mounts were all serial numbered to the rifles. Mike, there is no current source for these mounts. All you can do is to scrounge up such mounts and scope at gunshows or on ebay or egun and handfile the missing parts to fit the tops to yor gun bases.