This is a German adaptation of the famous novel. It was directed by Czechoslovakian director Karel Lamač. I have not seen the movie yet but the positive fact is that it also features the famous Beryl Stapleton scene. This one is VERY brief. Sherlock and his companions are searching for her. They hear some mmmphing and find Beryl (played by Alice Brandt) tied up in the closet. She is gagged with a white handkerchief tied over her mouth. It is taken off immediately.
Note: The sound and the picture of this video are not synchronized (I don't know how to fix it) but I think it doesn't matter much because the scene is very brief and there is no dialogue at all.