Thanks for the link to the interesting comparative engraving images. They strike me as expressive of an earlier classic style that this gun is to some extent modernising. I found this image of a Sauer & Sohn dated 1910 in Klups' book, which -notwithstanding the mechanical differences - has a similar air, at least to my eye.
[img]https://www.dropbox.com/s/fl90864xeplaqxw/Sauer-1910-Klups.jpg?dl=0[/img]