The Last Man on Earth is a 1964 post-apocalyptic science fiction horror film based on the 1954 novel I Am Legend by Richard Matheson. The film was produced by Robert L. Lippert and directed by Ubaldo Ragona and Sidney Salkow, and stars Vincent Price and Franca Bettoia.
https://en.wikipedia.org/wiki/The_Last_Man_on_Earth_(1964_film)
This one is great, I went through a post-apocalyptic cinema phase myself some years back and devoured everything out at the time.
Of course, it seems like the trove has doubled since then