Here is Penguin Books’ 1947 edition of Joseph Conrad’s first novel…
Though the portrait of Conrad on the book’s rear cover is undated, in terms of his general appearance and style of dress, the image is similar to Alvin Langdon Coburn’s photogravure of March 11, 1916 (at bottom), as seen in Conrad’s Wikipedia profile.
References
Joseph Conrad, at Wikipedia
Joseph Conrad, Alvin Langdon Coburn photogravure of March 11, 1916, from New York Public Library Digital Collection (Item 297498): “The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. “Joseph Conrad, London, March 11th, 1916.” The New York Public Library Digital Collections. 1922.”