I have a old Mauser that is a 7x57mm, on the side of the reciever it says "Deutsche Waffen-und Munitionseabriken Berlin. Then on the reciever and barrel there is a stamp on both saying C6838. Then on the bottom where the ammo goes and is near the trigger it says twice 2N 1805. Those are all the markings. If needed i will load pictures upon request.