"Schauspielhaus Künstler Redoute" - 1920s German Poster

Graphically striking Weimar-era poster with illustration of a soot-covered man playing the saxophone, advertising a performance at the Central Theater in an unidentified city, possibly Munich, ca. 1920s.  We have been unable to positively identify the artist who has signed "Osper." Slight edge tears, else in very fine condition.  23.6 x 35.4 inches (60 x 90 cm.). (19059)