YouTube is definitely the wild-west for video content, and if you look hard enough, you’ll find a lot of vintage video content. Quite a few of it is uploaded by people whose rights to publish the stuff is questionable, but while it’s there and before it gets taken down, it’s pretty fascinating to come across old commercials, television station idents, and little vignettes that exemplify past culture.
Here’s a good example: a 1971 Woolworth TV ad, promoting a sale on LP albums and even some 8-tracks:
An ad from a defunt store depicting a obsolete formats. Fascinating.