Ah-Ha, found info on DRP 7142:

>>The gun shown in Martin Krause's photos is an Immanuel Meffert, Suhl "Hubertus" safety gun, a later type with toplever opening. The unique triggerplate lockwork was invented and patented by the forester Franz Feist, Sommerschenburg, DRPatent # 7142 of 1879. I have an earlier example with the Lefaucheux underlever breech action, datable to 1893 both by the crown/V mark and family history. Opening the gun pushes back the hammers to the cocked position, as usual. Releasing that pistolgrip-like lever from the small of the stock partially uncocks the mainspring (yes, there is only one four-pronged omega-shaped spring in that double gun!), blocks the triggers and blocks the hammers back from the firing pins. If you want to use the gun you press that lever back to the stock, where it is caught by a little latch. Will post some photos soon. Only much later "Hubertus" became a more general I.Meffert trademark applied to drillings and other guns.<<

https://www.doublegunshop.com/forum...p;Words=feist&Search=true#Post328938

The action area of my own I.Meffert "Hubertus" safety gun. [Linked Image from up.picr.de]

The lockwork of this perfectly round actioned gun with the unique mainspring. This is the type of lock usually found in the "Hubertus" guns until end of production around WW1. "Safe" position.
[Linked Image from up.picr.de]

Another, even much earlier Meffert "Hubertus" gun. This V-spring lockwork is still much closer to Franz Feist's 1879 patent drawing."Fire" position in lockwork photo
[Linked Image from up.picr.de]

[Linked Image from up.picr.de]

Serbus,

Raimey
rse