Full pipe side-frame reinforcement on a Kerner-Anson action & Ferlach preliminary stamps, I'd say it was pre-WWII or right after. There is additional info there, just a bit fuzzy as you say. What's on the action flats/water table? Probably have to remove the wooden side panels with a proper turnscrew & there will be marks there.

Jani:
Was horn triggerguard bows typical on Ferlach offerings?

Kind Regards,

Raimey
rse