Since 1900, I doubt if relative production is even remotely close. But as @cal pappas notes, the vast majority of Continental OU's are not DG rifles. In that realm, the customer expectation, thanks to the British dominance of east and southern Africa, is a SxS. Since WWII, even the continental makers have been building the vast majority of their DG calibers in SxS format. I personally think that is unfortunate because the Kersten action is almost impossible to shoot off face. For instance, I have a thirties era German OU pigeon gun that not doubt has had hundreds of thousands of heavy high velocity loads through it in almost a hundred years of competition (I know I have put at least 10-20k through it while in my stewardship). It is as tight as the day it left Suhl. A Birmingham boxlock used in the same way would wobble like a fence gate. A London sidelock would have needed severe psychiatric intervention and would have been rebuilt two or three times during the same century after such use.
But from 1914 through the fifties, it was English perceptions of the "proper" double rifle that dominated. And you can find no critical thought offered in any of the discussion about double rifles. All the members of the writing fraternity (particularly those writing in English or Murican) simply repeat the what the last fellow said. It is a Versailles thing.
But from 1914 through the fifties, it was English perceptions of the "proper" double rifle that dominated. And you can find no critical thought offered in any of the discussion about double rifles. All the members of the writing fraternity (particularly those writing in English or Murican) simply repeat the what the last fellow said. It is a Versailles thing.