My gunsmith has a double rifle with a similarly ugly system he has bought in the fifties from the widow of the inventor in Suhl. I mean only the system in the white from which he then has built a teutonic double rifle in 8x57IRS with lots of gold and heavy game scene's.
the thing works similar like a luger pistol when the barrels are locked in the receiver and its in fact a toggle lock but in a break action.
The owner swears by the strength of the action and have told me that this the strongest action ever. but the nice double rifle is looking something,how to say it, kind of slanted or bent.