Found beat up German Luger dated 1911

[Patrick Chadwick]

7680 is the number. 882 should be 8,82 - the measured bore size.

If you want to smarten it up, use electrolytic cleaning, which does not remove any steel/iron, just rust.

Do use NOT bead blasting, which also removes some metal, and is thus is a good way of making any markings even more illegible.