Maybe I should rephrase my statement and say that a longarm example made at the Sauer facility will have the stamp of the "caveman" with a "staff", which is a registered Sauer trademark, and possibly a process mark in the tube making and/or fitting to the action. I would also consider the intertwined "SuS" to be a process mark. So a component could have been sourced from Sauer and then the final product was the result of effort of another craftsman like Ernst Steigleder.

But I couldn't exactly remember which makers offered a drilling similar to the one in question but I have found that E. Schmidt & Habermann had an offering as Model 500 marketed as a "Roux-Drilling" and a Model 501 as an upgrade with an automatic sight and English engraving. Friedrich Wilhelm Heym also had a similar Model 124 and a Model 125 with an automatic sight and English engraving. The similarities are too close for coincedence but I can't say if either was the source or was Meffert. I think both offered a combo with a similar frame.

If it is a Treff-battery drilling, there is a description in "The Drilling" by Klups on page 46.

Kind Regards,

Raimey
rse