STRANGE PORTRAIT …. 1966
(Mark) Jeffrey Hunter starred with Mai Tai Sing and Barbara Lee in this film. “Strange Portrait”, filmed on location in Hong Kong, never saw release. As explained on
Imdb.com, the story concerns “a crazy older person living in a mansion on a hill with lots of jewels that someone intended to steal from her.” By multiple accounts, a fire at a Hong Kong lab or warehouse destroyed the film’s negative. with no other copies in existence.
Paul Green’s biography of Jeff and the film’s Wikipedia page provide more information.