I've been collecting Naschy's werewolf films lately, but don't have this one. I've seen dodgy bootlegs for sale online, but haven't bit the bullet yet.
So far my favorite has been Night of the Werewolf (El Retorno del Hombre-Lobo) from 1980. Great photography and production value. Truly top notch gothic horror, at a time when even Hammer Films had given up.
I'm compiling a list of the Waldemar Daninsky films on Flixster, although they're missing a few from their database:
http://www.flixster.com/movie-list/t...demar-daninsky