Descendant Of Wing Chun (1978)
The plot for the movie is difficult to summarise, because it is rather complicated, and not particularly focussed. At heart though, you have 2 Wing Chun masters and their 2 students, and 2 deadly Eagle Claw-wielding bad guys.
Each group follows their own separate stories, has their own trials and tribulations, but their paths are gradually converging...
It's quite difficult (and not necessarily rewarding) to follow what's going on, but it makes for reasonable entertainment - and an excuse for a bunch of fights, naturally. Choreography is not bad, though there is nothing particularly new or special going on (to my untrained eyes). I always like a chance to see Fung Hak-On in action though, and his role is pretty substantial here :)