Portrait of a gentleman in smoking jacket

According to Johanna Share: „curious portrait of a man in whole shape in an kind of smoking jacket“; backside of painting (?) with mark "P" (= ownership collection Ploschitzki); Source: Werkverzeichnis Gemälde: Göpel, Erhard und Barbara: Max Beckmann, Katalog der Gemälde, 2 Bände, Bern 1976; Werkverzeichnis Druckgraphik: Hofmaier, James: Max Beckmann Catalogue raisonné of his Prints, Volume 1 + 2, Bern, Gallery Kornfeld, 1990 – without note of ownership Ploschitzki (Berlin) resp. Miss Share (heiress; Santa Monica/California)