Franz Bochmann !
Within 24 hours the identity of the artist in before post was (at last !) revealed by Dr. Rudolf Rieger from the "LETTER Stiftung" in Cologne. A foundation promoting Art and Culture with a research department and a library to support Art historians, Universities, research institutions and libraries. It researches, documents and collects, works and information concerning obscured, forgotten and lesser known artists in the fields of Sculpture, Medals and relief, and Graphics.
I tried to find biographic (any) data concerning Franz Bochmann who was active in Leipzig around 1930. He is not mentioned in any Artist Lexicon nor in Dresslers Kunsthandbuch 1921 & 1930. The signature was identified from a print "Zwei Pfefferfresser", in the Foundations collections and was published by the "Balder-Presse" (Gerhart Söhn u.a. : Die Balder Presse 1925-1934. Chronik und Werkkatalog; Düsseldorf 1996)
Thank Dr. Rieger, and thank you Wolfgang.