John Coles of the Kojutsukan blog has posted a set of 3 videos of his instructor -- the late Greg Palmer -- delivering his impressive second dan jujutsu grading (under the late Jan de Jong) in 1985*. They feature lecture-style explanation and 'quick action' demonstration from Sensei Palmer and his students, including a young John.
Each part is just over 10 minutes. The links are to John's blog, which give additional commentary and historical information:
*Technically, these are "take two", done for the camera.