Not a disappointment, I always like your posts, thanks for taking the time. If the rings alone were marked that would be one thing, but with the flat of the receiver dovetail having been marked, it is clearly the same maker building and installing these. For example, Mahrholdt making and installing their proprietary mounts and untold numbers of other makers doing the same so this could be really tough to track down. Thinking on Sch names there would be at least a dozen possibilities to explore. Also this rifle was retailed by Emil Kerner if that helps with any correlations.