Furthermore....
Rattigan is right about Basil Rathbone as Don Esteban, but if any of my fellow Americans want to follow up and rent or buy the film, they should be aware that in the U.S. it is known as "The Mark of Zorro." (I assume "Sign of Zorro" is the title they gave it in Great Britain.) And yes, it does contain the best duel I've seen in a film. No going up and down staircases or over balconies, no swinging from the chandelier...just a masterpiece of confined violence in the commandant's little office.
Another of the finest movie villains is pictured in Rattigan's avatar, the immortal Claude Rains. In the words of film historian Leslie Halliwell, Rains was "often villainous, but always suave and usually sympathetic." He is most famous for "The Invisible Man," but you should also check him out in Hitchcock's "Notorious" and the 1940's remake of "Phantom of the Opera." He's also nasty in "Adventures of Robin Hood," as Prince John, pulling the strings of Guy of Gisbourne (the aforementioned Rathbone).