Comes out of the tradition of Futura Black by Paul Renner (1929) or Braggadocio by W.A. Woolley (1930). Don’t know the exakt one. (If there is …)

Many thanks Renko. These letters seem so distinctive, and given the lack of response from our ace font detectives, seem to not exist as a digital font. I am tempted to make a font based on this limited set of letters and any hints I can get. Your suggestion of Renner's Futura Black of 1929 and Woolley's Braggadocio of 1930 as possible inspirations for this design is very helpful. The G in Braggadocio is really close, but other letters have a very different treatment.
I wonder what else might exist?
Don

Futura Black is very close and like you Don I may make a set of caps from this inspiration. Cool Book design.

Hi Bob, indeed it is a cool book design. I suspect this might have been a creation made by manipulating Futura during the photolettering era. The basic letter proportions are close to Futura. The letters might not have made it into any of the specimen books. If I understand correctly, a lot of this stuff was churned out as custom work for individual buyers, like book companies.
Don