Hmmm – I’'ve seen The Seven Faces of Doctor Lao. It was fairly famous when it came out – it’s hard to think of it as a movie “nobody knows”.
Saw The SWizard of Speed and Time, and met its director, Mike Jittlov. He’s got a lot of other shorts, equally wonderful, and I have no idea where you’d see them. If you get a chance, watch is Animato. It’s his “audition” piece, showing what he can do. Incidentally, he described his plans for a full-length feature versiion of TWOSAT back when he had just made the short version, and it was very different from the version released in 1989. I suspect he couldn’t get the money he needed, which is a shame. His planned version of TWOSAT would’ve been a helluva flick.
I’ve seen Deathwatch – it showed in art movie houses, and I’ve even taped it from TV. Interesting, but slow-moving.
I’ve mentioned Panic in Year Zero on these Boards before (and pretty recently, too). Ray Milland plays a father trying to save his family after unnamed Bad Guys (undoubtedly Commie Rooskies) nuke LA. Made about 1960 on a very low budgetm, but very well done.
Creation of the Humanoids – offbeat SF movie supposedly based on Jack Williamson’s novel “The Humanoids” (which the recent movie “I, Robot” resembles a lot more than it does Asimov’s novel), but which differs from its source radically. Worth watching.
The Hidden – might not be as unknown, but I’m surprised how few people seem to know about it.
Robinson Crusoe on Mars - ditto. Siurprisingly good SF from the early 1960s. Features a pre-Batman Adam West.