Here is an interesting old German rifle, I recently acquired from the brother of the WW2 vet that brought it home. It's chambered for a 4 mm rimfire round. When I got it, it was so dirty and covered in years of soot and gunk, that I didn't realize it was engraved until I started cleaning the poor thing, it cleaned up pretty well and functions and fires as it should. A beautiful piece of old word craftsmanship.