Greetings,
I accidentally stumbled upon this and I really enjoyed it. The footage looks to be much older than the videos put forth by Wing Lam Enterprises or Woo Tchi Nyu. I do remember being told that there was a set of Bal Sil Lum videos made for Kwong Wing Lam Sigung for his instructors before the instructional videos came out. Maybe this is from that set; or, maybe several sets were made over the years.
https://www.youtube.com/watch?v=wduOkMMs2nM
mickey