1974/70: Who? aka The Man in the Steel Mask, Roboman, Robo Man and Prisoner of the Skull 1974

 Watch movie:

https://youtu.be/-9_RG_e5PFQ?si=aZAEmgYw2hp7ZNfH

https://en.wikipedia.org/wiki/Who%3F_(film)

https://psychotroniccinema.com/2019/05/26/blu-ray-review-who/

https://fangsfirst.wordpress.com/2019/12/03/who-aka-the-man-in-the-steel-mask-aka-roboman-1974/ 

https://horrornews.net/124178/film-review-1974/