Ron,
I'm not sure what search word would I use except obviously Krieghoff; mount is Montage. When I need a vintage mount I try to find an old scope with such a mount, or a complete gun even. As an example, I needed the EAW twin-lever side mount recently (new cost 420 euros). I found a Winchester M94 with such a mount for less than the price of the mount, sold the gun and kept the mount for almost free - except a lot of my search time. I would look for a prewar Krieghoff drilling in bad condition (heavily pitted bores, etc.), took the rings or whatever I needed and sold the rest. BTW eBay might also be an option. -Jani