I am personally very pleased to have found this very rare 10 min video from the late 1960's of the late Masahilo Nakazono Shihan.
That's from Nakazono Sensei's seminar in Lerum, Sweden, 1969. A classic. Olle DehlÚn, one of the seniors of Swedish aikido, filmed it. He has put a lot of his aikido films - old as well as recent - on YouTube: