In 1930, a German magazine ran a piece on an autographed coat signed by various German film personalities, among them four associated with the 1929 classic Pandora's Box. Director G.W. Pabst signed the coat, as did actors Fritz Kortner and Franz Lederer and Louise Brooks. The Kansas-born actress who played Lulu -- one of the few non-German's to add their autograph -- signed the coat on the bottom right panel, and added "Hollywood" beneath her name.
Among the other well known names asked to autograph the coat are Lilian Harvey, Ivan Mosjoukin, Harry Liedtke, Henny Porten, and Werner Krauss. The latter starred in The Cabinet of Dr. Caligari as well as the earlier version of The Diary of a Lost Girl (1918). I wonder, where is that coat now?