Rather uncommon vintage 3.5 x 5.5-inch sepia-tone Ross Verlag postcard portrait, boldly signed with his name alone in black fountain pen, circa 1919 or 1920. In good condition. German-born character actor Theodor Loos had important roles in horror's Nachtgestalten (1920), Kriemhild's Revenge (1924), Metropolis (1927), M (1931), and The Testament of Dr. Mabuse (1932), among other classic films.