A lot of truth in what Jerry wrote. Not everyone is interested in keeping a really good English trained gunsmith in shrimp, steak and beer for the next 6 months putting an old good gun back to right. Maintenance on an old double is a different word, with a different meaning, versus how the same word is used on something like an 870 pump.
If you are just going to have one, go newer, with modern ammunition capability.

Best,
Ted