Here's THE STORY OF SUPERMAN, "Educational Film 147," narrated by radio announcer Kenneth Banghart. This is a creaky but fun introduction to Superman.
This is new to me. I don't know the actor playing Superman (It's not Kirk Alyn.) and the film does not show up on IMDB. If anyone has more information, please let me know.
Hat tip to Mark Waid:
It's well known in enough by some to have elicited this corny reimagined spoof via YouTuber Dan Lerman: