Thanks to Master Daniel Segarra, former member of the US Soo Bahk Do Moo Duk Kwan Federation and the current founder of his own art–Moo Sa Do Kwan–for posting these priceless videos of Tang Soo Do Moo Duk Kwan.  The first one is Kwan Jang Nim H.C. Hwang himself sparring.  The second is an instructional video.  Both were filmed in the 1960s, the Golden Age of the Moo Duk Kwan.