Thanks to Damon Kiesow, I came across this fascinating blog post about a newspaper edition that has been passed around Hollywood– showing up in countless tv shows and films across the decades. The speculation is that it is copyright cleared-with royalty free images. This makes sense because in a film or television show, you clear the copyright for all of the images in the background and on the set. It can be a challenging process if your don’t have rights to everything.
See for yourself: