The basic sxs design used by the German Big 3 (Sauer/Merkel/Simson) is very much the same. And most other German doubles follow the same pattern. In particular, the ones that weren't made for export are usually fitted with a Greener crossbolt, have double triggers, usually a pistol grip of some sort, sling swivels, and a cheekpiece.
One significant point was the use of the Kerner-Anson action design. One problem with the regular A&D action was that if it was struck hard on the butt it could go off. Since Fritz liked to walk around with his gun slung, a slip when going down a muddy German mountain could easily result in him blowing his own head off. The Brits came up with intercepting safety sears, but the Krauts waited until the patent protection wore off, then moved the sear fulcrum from the bottom rear to the top rear of the receiver. Much safer. Hence the Kerner-Anson. (nod to Raimey's knowledge)
Axel E. on the subject:
"See the screw at the lower rear of the action body? This is the fulcrum of the original design Anson & Deeley sear. It is in the bottom of the action body and engages a detent in the tumbler from below, close to the tumbler fulcrum. During the 1920s the Suhl gunmakers almost universally adopted E.Kerner's modification of the A&D lockwork. Kerner relocated the sears to the top/rear of the action. They turn on a screw located at the top rear of the action and engage a detent on the top of the tumblers, removed as far as possible from the hammer fulcrum. This arrangement vastly improved the leverage. As much less mainspring pressure rested on the sear detent, Kerner's top sears allow lighter and at the same time safer trigger releases. Secondary safety sears are unnecessary with Kerner's sear arrangement. "
Regards
Ken
