Is it Emil Kerner & Sohn? It is post 1912 and pre-1923 from what I see. Experienced a repair at some point. Can you get a closeup of the K just above the "Crown" over S(Schrot) on the underside of the right tube? Looks similar to F.W. Keler's locks. What is on the water table or standing breech?

Kind Regards,

Raimey
rse