Did you take any pictures?

It dont think Kruppscher is anything other then the steel the barrels are made from. Take a look at the extractor and see if its a rimless one, then it probably chambered for the 8x56ms cartridge.

The sight sound as often seen on Merkel and sauer drillings, they are also sold to gunsmiths and retailers and marked by them, so look for stamps to make out the origin of the rifle.