It looks like a modified standard system. I can´t say anything about where the drilling was build. Miller was one of the largest Guntraders in these times. I think Collath worked for him. Maybe I can ask my boss, Mr. Retz sr.. He´s 81 years now, I think he knows something about this.

For more questions about German guns buildet from 1890-1940, please ask. We´re spezialized in rebuilding finest systems like the original Nimrod from Thieme&Schlegelmilch or the Sauer Stabillock.

Frank