The basic design of this action is a quite old one, already shown and described in A.Zimmer’s 1868 book on then modern hunting guns. Daw imported such German made guns to England where they were known as “Daw’s hammerless guns”. Emil Barthelmes, Zella-Mehlis, used this action on drillings he made for Kern, Nuremberg most often until about WW1. He replaced the original C-shaped mainsprings with coil springs around the strikers.
The safety on these guns is quite unusual. It’s a bar and a disc with holes for the strikers set left to right in the breechface. Here are two photos of two other such Barthelmes/Kern drillings. The first one shows the “Fire” position, the bar pushed to the right. The second one is on “Safe”, crossbar pushed over, blocking the strikers. Note, on these two dillings the safeties operate in opposite directions.
The locks are cocked by the movement of the opening underlever.