Maybe the basic question is whether you want a new gun or, to get one that will function as well, pay about half again as much for an older 'vintage' DR.

I agree bulldog that if you are looking for a used DR, George at Champlain is the man to speak to. I have never had anything but honest and straightforward advice on his used inventory and if you don't like it, he takes it back with no issues. He has no doubt handled more doubles than most of us have ever seen and has JJ as his in house gunsmith who can check out or fix virtually anything. But look at the guns Bulldog listed as examples. The new Chapuis he lists (which I understand is now sold, but he has others on the way) in 470 will cost less than a lot of functionable, but well worn and a bit beat up double from the UK in lesser calibers. The Douglas he had listed in 470 is sold, but was also a recent vintage gun. You want a pristine A&N 470, about as 'generic' as one can get in a 470, and you will pay double the price of the Chapuis. You want a WR or the like? Pony up big money.

If you want a double to hunt, and are not buying to collect or just want a quality British DR, then the choices Bulldog lists makes sense. And, as new rifles go, a slightly used Merkel, Chapuis, Kreighoff, etc will still bring a substantial percentage of new price. The Blaser will 'depreciate' more as it is not as popular or perhaps just too quirky for some.

Horses for courses. Just to shoot, go new. To keep, and if you want to pay a bunch more, go 'vintage.' Dave