one of my favorite kung fu movies- favorite Shaw Brothers' movies- you name it. none of the styles are actually a real form (the snake style is invented in for this movie). it's got an unusual set up and story, which is what sets it apart from most other martial arts movies. I saw this in West Virginia on the great Channel 20, some weekend afternoon.
it's funny how the actors in this movies are now known as the "Venoms Mob" or some other variation on that. they weren't going for any kind of "series" just making good entertaining movies. this is the US trailer, probably for tv promos.