The era of the ultimate and real gung fu was about 1975 to 1985, give or take a few years. Of course, the time period could probably include the time period of 1985 to 1995, because that is when those movies hit the late night TV circuit. And, of course, chop sockies forever, because we can now get them on Amazon, though we should make sure it is a clean copy and that we have a good DVD player.