My No 1 double rifle has been a G. Genschow in 500/465 Nitro for the past tweenty-five years and I have taken quite a few buffalo and elephant with it. BTW, the name is Genschow not Gemschow as WR has it listed. I selected my rifle because it fit better, was better regulated, lighter and more accurate than any of the 15 or so english doubles I had owned previously. The only negative I see to this one is the lack of ejectors. If it is the original stock check how thin the comb is. Original factory comb on mine was a knife edge. It came with a well done replacement stock.
I have never - before - been a fan of the clamshell action, but those two rifles are the trimmest clamshells I've ever seen. And both right around 10lbs, which is about perfect in my opinion.
Hate to burst your bubble boys but that is not a clamshell action. It is part of the action itself. Kind of like a brace between the face and the water table.(German)