Source: https://www.flickr.com.Uploaded to Flickr by Philipp Messner and tagged with "corvinus". License: CC BY-NC.

Published by Jakob Hegner, Hellerau. Dust jacket printed by Spamer, Leipzig.

The typeface is Imre Reiner'sCorvinus, in Bold and Medium. It was released in 1934.

The book itself is the first edition from 1926, but the dust jacket doesn't look like Hegner 1926 (for comparison: the jacket of a book he published in 1925). Maybe some remainder of the edition was sold later with a new jacket. Hegner, as far as I know, faced severe financial difficulties in the early 1930s and had to close his press in Hellerau.