I have an older Darne 16 gauge with pitted to cratered bores. It has old property numbers stamped in the wood reflecting either military service or police evidence at some point in its life.
I have always assumed it might have been to Vietnam based on the bores. The wood and exterior metal look fine.
It shoots fine as well with factory 2 3/4 Remington game loads, I assume the bores look worse than the reality.