Another video from Chinen Shinzo. Filmed in 1975.

I think at the 6:44 mark its Odo Seikichi doing niccho gama, and at the 7:30 mark it’s Matayoshi sensei doing Eku-di.

Another video from showing a man practicing in his garden in the 1970s: Maezato no Nunchaku, Sakugawa no non (sho), Naihanchi shodan.