W. Collin binding on v. Menzel

Back in September of 2020, I acquired the W. Collin binding on Adolf von Menzel depicted below. 

This weekend, I downloaded a copy of Deutsche Einbandkunst im ersten Jahrzehnt des zwanzigsten Jahrhunderts by the great German bibliophile and author of the time G.A.E. Bogeng. Hathitrust is great for this sort of thing.

Title page, the book was published in [1911].

It was printed by orphans in Halle a. Salle.

Binding by Collin in cut leather (Lederschnitt) with dyed leather.

Hey, I recognize that book...

In my original post I had surmized the book was bound by the firm of W. Collin after 1918 based on the way it was signed, without the Hofbuchbinder (Court bookbinder). Since the book it was depicted in is from 1911 that clearly can't be the case. Good to know. Now to update that original post.